Organic electroluminescence device and electronic apparatus

ABSTRACT

An organic electroluminescence device including: an anode, a cathode, and at least one emitting layer between the cathode and the anode, wherein the emitting layer contains a first host material, a second host material, and a dopant material, the first host material is a compound having at least one deuterium atom, and the emitting layer contains the first host material in the proportion of 1% by mass or more.

CROSS-REFERENCE TO RELATED APPLICATIONS

The present application is a continuation of U.S. application Ser. No.17/285,733 filed Apr. 15, 2021, which claims priority under 35 U.S.C. §371 to International Patent Application No. PCT/JP2019/040710, filedOct. 16, 2019, which claims priority to and the benefit of JapanesePatent Application No. 2018-194950, filed on Oct. 16, 2018. The contentsof these applications are hereby incorporated by reference in theirentireties.

TECHNICAL FIELD

The invention relates to an organic electroluminescence device and anelectronic apparatus.

BACKGROUND ART

When voltage is applied to an organic electroluminescence device(hereinafter, referred to as an organic EL device), holes and electronsare injected into an emitting layer from an anode and a cathode,respectively. Then, thus injected holes and electrons are recombined inthe emitting layer, and excitons are formed therein.

The organic EL device includes the emitting layer between the anode andthe cathode. Further, the organic EL device has a stacked structureincluding an organic layer such as a hole-injecting layer, ahole-transporting layer, an electron-injecting layer, and anelectron-transporting layer in several cases.

Patent Documents 1 to 4 disclose deuterated aryl-anthracene compoundsuseful for electronic applications, and electronic devices in which theactive layer contains such deuterated compound.

RELATED ART DOCUMENTS Patent Documents

[Patent Document 1] WO 2010/099534 A1 [Patent Document 2] WO 2010/135395A1 [Patent Document 3] WO 2011/028216 A1 [Patent Document 4] WO2010/071362 A1

SUMMARY OF THE INVENTION

It is an object of the invention to provide a long-lifetime organicelectroluminescence device and electronic apparatus, by using adeuterated material.

According to an aspect of the invention, the following organicelectroluminescence device is provided.

An organic electroluminescence device comprising: an anode, a cathode,and at least one emitting layer between the cathode and the anode,wherein

the emitting layer comprises a first host material, a second hostmaterial, and a dopant material,

the first host material is a compound having at least one deuteriumatom, and

the emitting layer comprises the first host material in the proportionof 1% by mass or more.

According to another aspect of the invention, a composition for anemitting layer of an organic electroluminescence device, comprising: afirst host material, a second host material, and a dopant material,wherein, the first host material is a compound having at least onedeuterium atom, and the first host material is comprised in theproportion of 1% by mass or more is provided.

According to another aspect of the invention, an electronic apparatus,equipped with the organic electroluminescence device is provided.

According to the invention, a long-lifetime organic electroluminescencedevice and electronic apparatus can be provided by using a deuteratedmaterial.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows a schematic configuration of an organic EL device accordingto a first aspect of the invention.

FIG. 2 shows a schematic configuration of an organic EL device accordingto a second aspect of the invention.

FIG. 3 shows a schematic configuration of an organic EL device accordingto a third aspect of the invention.

MODE FOR CARRYING OUT THE INVENTION

[Definition]

In this specification, a hydrogen atom means an atom including isotopesdifferent in the number of neutrons, namely, a protium, a deuterium anda tritium.

In this specification, to a bondable position in which a symbol such as“R”, or “D” representing a deuterium atom is not specified in a chemicalformula, a hydrogen atom, that is, a protium atom, a deuterium atom, ora tritium atom is bonded thereto.

In this specification, a term “ring carbon atoms” represents the numberof carbon atoms among atoms forming a subject ring itself of a compoundhaving a structure in which atoms are bonded in a ring form (forexample, a monocyclic compound, a fused ring compound, a cross-linkedcompound, a carbocyclic compound or a heterocyclic compound). When thesubject ring is substituted by a substituent, the carbon contained inthe substituent is not included in the number of ring carbon atoms. Thesame shall apply to the “ring carbon atoms” described below, unlessotherwise noted. For example, a benzene ring has 6 ring carbon atoms, anaphthalene ring has 10 ring carbon atoms, a pyridine ring has 5 ringcarbon atoms, and a furan ring has 4 ring carbon atoms. Further, forexample, a 9,9-diphenylfluorenyl group has 13 ring carbon atoms, and a9,9′-spirobifluorenyl group has 25 ring carbon atoms.

Further, when the benzene ring or the naphthalene ring is substituted byan alkyl group as a substituent, for example, the number of carbon atomsof the alkyl group is not included in the ring carbon atoms.

In this specification, a term “ring atoms” represents the number ofatoms forming a subject ring itself of a compound having a structure inwhich atoms are bonded in a ring form (for example, a monocycle, a fusedring and a ring assembly) (for example, a monocyclic compound, a fusedring compound, a cross-linked compound, a carbocyclic compound or aheterocyclic compound). The term “ring atoms” does not include atomswhich do not form the ring (for example, a hydrogen atom whichterminates a bond of the atoms forming the ring) or atoms contained in asubstituent when the ring is substituted by the substituent. The sameshall apply to the “ring atoms” described below, unless otherwise noted.For example, a pyridine ring has 6 ring atoms, a quinazoline ring has 10ring atoms, and a furan ring has 5 ring atoms. A hydrogen atom bondedwith a carbon atom of the pyridine ring or the quinazoline ring or anatom forming the substituent is not included in the number of the ringatoms.

In this specification, a term “XX to YY carbon atoms” in an expressionof “substituted or unsubstituted ZZ group including XX to YY carbonatoms” represents the number of carbon atoms when the ZZ group isunsubstituted. The number of carbon atoms of a substituent when the ZZgroup is substituted is not included. Here, “YY” is larger than “XX”,and “XX” and “YY” each mean an integer of 1 or more.

In this specification, a term “XX to YY atoms” in an expression of“substituted or unsubstituted ZZ group including XX to YY atoms”represents the number of atoms when the ZZ group is unsubstituted. Thenumber of atoms of a substituent when the group is substituted is notincluded. Here, “YY” is larger than “XX”, and “XX” and “YY” each mean aninteger of 1 or more.

A term “unsubstituted” in the case of “substituted or unsubstituted ZZgroup” means that the ZZ group is not substituted by a substituent, anda hydrogen atom is bonded therewith. Alternatively, a term “substituted”in the case of “substituted or unsubstituted ZZ group” means that one ormore hydrogen atoms in the ZZ group are substituted by a substituent.Similarly, a term “substituted” in the case of “BB group substituted byan AA group” means that one or more hydrogen atoms in the BB group aresubstituted by the AA group.

Hereinafter, the substituent described herein will be described.

The number of the ring carbon atoms of the “unsubstituted aryl group”described herein is 6 to 50, preferably 6 to 30, and more preferably 6to 18, unless otherwise specified.

The number of the ring carbon atoms of the “unsubstituted heterocyclicgroup” described herein is 5 to 50, preferably 5 to 30, and morepreferably 5 to 18, unless otherwise specified.

The number of the carbon atoms of the “unsubstituted alkyl group”described herein is 1 to 50, preferably 1 to 20, and more preferably 1to 6, unless otherwise specified.

The number of the carbon atoms of the “unsubstituted alkenyl group”described herein is 2 to 50, preferably 2 to 20, and more preferably 2to 6, unless otherwise specified.

The number of the carbon atoms of the “unsubstituted alkynyl group”described herein is 2 to 50, preferably 2 to 20, and more preferably 2to 6, unless otherwise specified.

The number of the ring carbon atoms of the “unsubstituted cycloalkylgroup” described herein is 3 to 50, preferably 3 to 20, and morepreferably 3 to 6, unless otherwise specified.

The number of the ring carbon atoms of the “unsubstituted arylene group”described herein is 6 to 50, preferably 6 to 30, and more preferably 6to 18, unless otherwise specified.

The number of the ring atoms of the “unsubstituted divalent heterocyclicgroup” described herein is 5 to 50, preferably 5 to 30, and morepreferably 5 to 18, unless otherwise specified.

The number of the carbon atoms of the “unsubstituted alkylene group”described herein is 1 to 50, preferably 1 to 20, and more preferably 1to 6, unless otherwise specified.

Specific examples (specific example group G1) of the “substituted orunsubstituted aryl group” described herein include an unsubstituted arylgroup and a substituted aryl group described below. (Here, a term“unsubstituted aryl group” refers to a case where the “substituted orunsubstituted aryl group” is the “unsubstituted aryl group,” and a term“substituted aryl group” refers to a case where the “substituted orunsubstituted aryl group” is the “substituted aryl group”. Hereinafter,a case of merely “aryl group” includes both the “unsubstituted arylgroup” and the “substituted aryl group”.

The “substituted aryl group” refers to a case where the “unsubstitutedaryl group” has a substituent, and specific examples thereof include agroup in which the “unsubstituted aryl group” has the substituent, and asubstituted aryl group described below. It should be noted that examplesof the “unsubstituted aryl group” and examples of the “substituted arylgroup” listed herein are only one example, and the “substituted arylgroup” described herein also includes a group in which a group in which“unsubstituted aryl group” has a substituent further has a substituent,and a group in which “substituted aryl group” further has a substituent,and the like.

An unsubstituted aryl group:

-   a phenyl group,-   a p-biphenyl group,-   a m-biphenyl group,-   an o-biphenyl group,-   a p-terphenyl-4-yl group,-   a p-terphenyl-3-yl group,-   a p-terphenyl-2-yl group,-   a m-terphenyl-4-yl group,-   a m-terphenyl-3-yl group,-   a m-terphenyl-2-yl group,-   an o-terphenyl-4-yl group,-   an o-terphenyl-3-yl group,-   an o-terphenyl-2-yl group,-   a 1-naphthyl group,-   a 2-naphthyl group,-   an anthryl group,-   a benzanthryl group,-   a phenanthryl group,-   a benzophenanthryl group,-   a phenalenyl group,-   a pyrenyl group,-   a chrysenyl group,-   a benzochrysenyl group,-   a triphenylenyl group,-   a benzotriphenylenyl group,-   a tetracenyl group,-   a pentacenyl group,-   a fluorenyl group,-   a 9,9′-spirobifluorenyl group,-   a benzofluorenyl group,-   a dibenzofluorenyl group,-   a fluoranthenyl group,-   a benzofluoranthenyl group, and-   a perylenyl group.

A substituted aryl group:

-   an o-tolyl group,-   a m-tolyl group,-   a p-tolyl group,-   a p-xylyl group,-   a m-xylyl group,-   an o-xylyl group,-   a p-isopropyl phenyl group,-   a m-isopropyl phenyl group,-   an o-isopropyl phenyl group,-   a p-t-butylphenyl group,-   a m-t-butylphenyl group,-   an o-t-butylphenyl group,-   a 3,4,5-trimethylphenyl group,-   a 9,9-dimethylfluorenyl group,-   a 9,9-diphenylfluorenyl group-   a 9,9-di(4-methylphenyl)fluorenyl group,-   a 9,9-di(4-isopropylphenyl)fluorenyl group,-   a 9,9-di(4-t-butylphenyl)fluorenyl group,-   a cyanophenyl group,-   a triphenylsilylphenyl group,-   a trimethylsilylphenyl group,-   a phenylnaphthyl group, and-   a naphthylphenyl group.

The “heterocyclic group” described herein is a ring group including atleast one hetero atom in the ring atom. Specific examples of the heteroatom include a nitrogen atom, an oxygen atom, a sulfur atom, a siliconatom, a phosphorus atom and a boron atom.

The “heterocyclic group” described herein may be a monocyclic group, ora fused ring group.

The “heterocyclic group” described herein may be an aromaticheterocyclic group, or an aliphatic heterocyclic group.

Specific examples (specific example group G2) of the “substituted orunsubstituted heterocyclic group” include an unsubstituted heterocyclicgroup and a substituted heterocyclic group described below. (Here, theunsubstituted heterocyclic group refers to a case where the “substitutedor unsubstituted heterocyclic group” is the “unsubstituted heterocyclicgroup,” and the substituted heterocyclic group refers to a case wherethe “substituted or unsubstituted heterocyclic group” is the“substituted heterocyclic group”. Hereinafter, the case of merely“heterocyclic group” includes both the “unsubstituted heterocyclicgroup” and the “substituted heterocyclic group”.

The “substituted heterocyclic group” refers to a case where the“unsubstituted heterocyclic group” has a substituent, and specificexamples thereof include a group in which the “unsubstitutedheterocyclic group” has a substituent, and a substituted heterocyclicgroup described below. It should be noted that examples of the“unsubstituted heterocyclic group” and examples of the “substitutedheterocyclic group” listed herein are merely one example, and the“substituted heterocyclic group” described herein also includes a groupin which “unsubstituted heterocyclic group” which has a substituentfurther has a substituent, and a group in which “substitutedheterocyclic group” further has a substituent, and the like.

An unsubstituted heterocyclic group including a nitrogen atom:

-   a pyrrolyl group,-   an imidazolyl group,-   a pyrazolyl group,-   a triazolyl group,-   a tetrazolyl group,-   an oxazolyl group,-   an isoxazolyl group,-   an oxadiazolyl group,-   a thiazolyl group,-   an isothiazolyl group,-   a thiadiazolyl group,-   a pyridyl group,-   a pyridazinyl group,-   a pyrimidinyl group,-   a pyrazinyl group,-   a triazinyl group,-   an indolyl group,-   an isoindolyl group,-   an indolizinyl group,-   a quinolizinyl group,-   a quinolyl group,-   an isoquinolyl group,-   a cinnolyl group,-   a phthalazinyl group,-   a quinazolinyl group,-   a quinoxalinyl group,-   a benzimidazolyl group,-   an indazolyl group,-   a phenanthrolinyl group,-   a phenanthridinyl group-   an acridinyl group,-   a phenazinyl group,-   a carbazolyl group,-   a benzocarbazolyl group,-   a morpholino group,-   a phenoxazinyl group,-   a phenothiazinyl group,-   an azacarbazolyl group, and-   a diazacarbazolyl group.

An unsubstituted heterocyclic group including an oxygen atom:

-   a furyl group,-   an oxazolyl group,-   an isoxazolyl group,-   an oxadiazolyl group,-   a xanthenyl group,-   a benzofuranyl group,-   an isobenzofuranyl group,-   a dibenzofuranyl group,-   a naphthobenzofuranyl group,-   a benzoxazolyl group,-   a benzisoxazolyl group,-   a phenoxazinyl group,-   a morpholino group,-   a dinaphthofuranyl group,-   an azadibenzofuranyl group,-   a diazadibenzofuranyl group,-   an azanaphthobenzofuranyl group, and-   a diazanaphthobenzofuranyl group.

An unsubstituted heterocyclic group including a sulfur atom:

-   a thienyl group,-   a thiazolyl group,-   an isothiazolyl group,-   a thiadiazolyl group,-   a benzothiophenyl group,-   an isobenzothiophenyl group,-   a dibenzothiophenyl group,-   a naphthobenzothiophenyl group,-   a benzothiazolyl group,-   a benzisothiazolyl group,-   a phenothiazinyl group,-   a dinaphthothiophenyl group,-   an azadibenzothiophenyl group,-   a diazadibenzothiophenyl group,-   an azanaphthobenzothiophenyl group, and-   a diazanaphthobenzothiophenyl group.

A substituted heterocyclic group including a nitrogen atom:

-   a (9-phenyl)carbazolyl group,-   a (9-biphenylyl)carbazolyl group,-   a (9-phenyl)phenylcarbazolyl group,-   a (9-naphthyl)carbazolyl group,-   a diphenylcarbazol-9-yl group,-   a phenylcarbazol-9-yl group,-   a methylbenzimidazolyl group,-   an ethylbenzimidazolyl group,-   a phenyltriazinyl group,-   a biphenylyltriazinyl group,-   a diphenyltriazinyl group,-   a phenylquinazolinyl group, and-   a biphenylylquinazolinyl group.

A substituted heterocyclic group including an oxygen atom:

-   a phenyldibenzofuranyl group,-   a methyldibenzofuranyl group,-   a t-butyldibenzofuranyl group, and-   a monovalent residue of spiro[9H-xanthene-9,9′-[9H]fluorene].

A substituted heterocyclic group including a sulfur atom:

-   a phenyldibenzothiophenyl group,-   a methyldibenzothiophenyl group,-   a t-butyldibenzothiophenyl group, and-   a monovalent residue of spiro[9H-thioxantene-9,9′-[9H]fluorene].

A monovalent group derived from the following unsubstituted heterocyclicring containing at least one of a nitrogen atom, an oxygen atom and asulfur atom by removal of one hydrogen atom bonded to the ring atomsthereof, and a monovalent group in which a monovalent group derived fromthe following unsubstituted heterocyclic ring has a substituent byremoval of one hydrogen atom bonded to the ring atoms thereof:

In the formulas (XY-1) to (XY-18), X_(A) and Y_(A) are independently anoxygen atom, a sulfur atom, NH or CH₂. However, at least one of X_(A)and Y_(A) is an oxygen atom, a sulfur atom or NH.

The heterocyclic ring represented by the formulas (XY-1) to (XY-18)becomes a monovalent heterocyclic group including a bond at an arbitraryposition.

An expression “the monovalent group derived from the unsubstitutedheterocyclic ring represented by the formulas (XY-1) to (XY-18) has asubstituent” refers to a case where the hydrogen atom bonded with thecarbon atom which constitutes a skeleton of the formulas is substitutedby a substituent, or a state in which X_(A) or Y_(A) is NH or CH₂, andthe hydrogen atom in the NH or CH₂ is replaced with a substituent.

Specific examples (specific example group G3) of the “substituted orunsubstituted alkyl group” include an unsubstituted alkyl group and asubstituted alkyl group described below. (Here, the unsubstituted alkylgroup refers to a case where the “substituted or unsubstituted alkylgroup” is the “unsubstituted alkyl group,” and the substituted alkylgroup refers to a case where the “substituted or unsubstituted alkylgroup” is the “substituted alkyl group”). Hereinafter, the case ofmerely “alkyl group” includes both the “unsubstituted alkyl group” andthe “substituted alkyl group”.

The “substituted alkyl group” refers to a case where the “unsubstitutedalkyl group” has a substituent, and specific examples thereof include agroup in which the “unsubstituted alkyl group” has a substituent, and asubstituted alkyl group described below. It should be noted thatexamples of the “unsubstituted alkyl group” and examples of the“substituted alkyl group” listed herein are merely one example, and the“substituted alkyl group” described herein also includes a group inwhich “unsubstituted alkyl group” has a substituent further has asubstituent, a group in which “substituted alkyl group” further has asubstituent, and the like.

An unsubstituted alkyl group:

-   a methyl group,-   an ethyl group,-   a n-propyl group,-   an isopropyl group,-   a n-butyl group,-   an isobutyl group,-   a s-butyl group, and-   a t-butyl group.

A substituted alkyl group:

-   a heptafluoropropyl group (including an isomer),-   a pentafluoroethyl group,-   a 2,2,2-trifluoroethyl group, and-   a trifluoromethyl group.

Specific examples (specific example group G4) of the “substituted orunsubstituted alkenyl group” include an unsubstituted alkenyl group anda substituted alkenyl group described below. (Here, the unsubstitutedalkenyl group refers to a case where the “substituted or unsubstitutedalkenyl group” is the “unsubstituted alkenyl group,” and the substitutedalkenyl group refers to a case where the “substituted or unsubstitutedalkenyl group” is the “substituted alkenyl group”). Hereinafter, thecase of merely “alkenyl group” includes both the “unsubstituted alkenylgroup” and the “substituted alkenyl group”.

The “substituted alkenyl group” refers to a case where the“unsubstituted alkenyl group” has a substituent, and specific examplesthereof include a group in which the “unsubstituted alkenyl group” has asubstituent, and a substituted alkenyl group described below. It shouldbe noted that examples of the “unsubstituted alkenyl group” and examplesof the “substituted alkenyl group” listed herein are merely one example,and the “substituted alkenyl group” described herein also includes agroup in which “unsubstituted alkenyl group” has a substituent furtherhas a substituent, a group in which “substituted alkenyl group” furtherhas a substituent, and the like.

An unsubstituted alkenyl group and a substituted alkenyl group:

-   a vinyl group,-   an allyl group,-   a 1-butenyl group,-   a 2-butenyl group,-   a 3-butenyl group,-   a 1,3-butanedienyl group,-   a 1-methylvinyl group,-   a 1-methylallyl group,-   a 1,1-dimethylallyl group,-   a 2-methylallyl group, and-   a 1,2-dimethylallyl group.

Specific examples (specific example group G5) of the “substituted orunsubstituted alkynyl group” include an unsubstituted alkynyl groupdescribed below. (Here, the unsubstituted alkynyl group refers to a casewhere the “substituted or unsubstituted alkynyl group” is the“unsubstituted alkynyl group”). Hereinafter, a case of merely “alkynylgroup” includes both the “unsubstituted alkynyl group” and the“substituted alkynyl group”.

The “substituted alkynyl group” refers to a case where the“unsubstituted alkynyl group” has a substituent, and specific examplesthereof include a group in which the “unsubstituted alkynyl group”described below has a substituent.

An unsubstituted alkynyl group:

-   an ethynyl group.

Specific examples (specific example group G6) of the “substituted orunsubstituted cycloalkyl group” described herein include anunsubstituted cycloalkyl group and a substituted cycloalkyl groupdescribed below. (Here, the unsubstituted cycloalkyl group refers to acase where the “substituted or unsubstituted cycloalkyl group” is the“unsubstituted cycloalkyl group,” and the substituted cycloalkyl grouprefers to a case where the “substituted or unsubstituted cycloalkylgroup” is the “substituted cycloalkyl group”). Hereinafter, a case ofmerely “cycloalkyl group” includes both the “unsubstituted cycloalkylgroup” and the “substituted cycloalkyl group”.

The “substituted cycloalkyl group” refers to a case where the“unsubstituted cycloalkyl group” a the substituent, and specificexamples thereof include a group in which the “unsubstituted cycloalkylgroup” has a substituent, and a substituted cycloalkyl group describedbelow. It should be noted that examples of the “unsubstituted cycloalkylgroup” and examples of the “substituted cycloalkyl group” listed hereinare merely one example, and the “substituted cycloalkyl group” describedherein also includes a group in which “unsubstituted cycloalkyl group”has a substituent further has a substituent, a group in which“substituted cycloalkyl group” further has a substituent, and the like.

An unsubstituted aliphatic ring group:

-   a cyclopropyl group,-   a cyclobutyl group,-   a cyclopentyl group,-   a cyclohexyl group,-   a 1-adamantyl group,-   a 2-adamantyl group,-   a 1-norbomyl group, and-   a 2-norbomyl group.

A substituted cycloalkyl group:

-   a 4-methylcydohexyl group.

Specific examples (specific example group G7) of the group representedby —Si(R₉₀₁)(R₉₀₂)(R₉₀₃) described herein include

-   —Si(G1)(G1)(G1),-   —Si(G1)(G2)(G2),-   —Si(G1)(G1)(G2),-   —Si(G2)(G2)(G2),-   —Si(G3)(G3)(G3),-   —Si(G5)(G5)(G5) and-   —Si(G6)(G6)(G6).

In which,

G1 is the “aryl group” described in the specific example group G1.

G2 is the “heterocyclic group” described in the specific example groupG2.

G3 is the “alkyl group” described in the specific example group G3.

G5 is the “alkynyl group” described in the specific example group G5.

G6 is the “cycloalkyl group” described in the specific example group G6.

Specific examples (specific example group G8) of the group representedby —O—(R₉₀₄) described herein include

-   —O(G1),-   —O(G2),-   —O(G3) and-   —O(G6).

In which, G1 is the “aryl group” described in the specific example groupG1.

G2 is the “heterocyclic group” described in the specific example groupG2.

G3 is the “alkyl group” described in the specific example group G3.

G6 is the “cycloalkyl group” described in the specific example group G6.

Specific examples (specific example group G9) of the group representedby —S—(R₉₀₅) described herein include

-   —S(G1),-   —S(G2),-   —S(G3) and-   —S(G6).

In which,

G1 is the “aryl group” described in the specific example group G1.

G2 is the “heterocycle group” described in the specific example groupG2.

G3 is the “alkyl group” described in the specific example group G3.

G6 is the “cycloalkyl group” described in the specific example group G6.

Specific examples (specific example group G10) of the group representedby —N(R₉₀₆)(R₉₀₇) described herein include

-   —N(G1)(G1),-   —N(G2)(G2),-   —N(G1)(G2),-   —N(G3)(G3) and-   —N(G6) (G6).

In which,

G1 is the “aryl group” described in the specific example group G1.

G2 is the “heterocycle group” described in the specific example groupG2.

G3 is the “alkyl group” described in the specific example group G3.

G6 is the “cycloalkyl group” described in the specific example group G6.

Specific examples (specific example group G11) of the “halogen atom”described herein include a fluorine atom, a chlorine atom, a bromineatom and an iodine atom.

Specific examples of the “alkoxy group” described herein include a grouprepresented by —O(G3), where G3 is the “alkyl group” described in thespecific example group G3. The number of carbon atoms of the“unsubstituted alkoxy group” are 1 to 50, preferably 1 to 30, and morepreferably 1 to 18, unless otherwise specified.

Specific examples of the “alkylthio group” described herein include agroup represented by —S(G3), where G3 is the “alkyl group” described inthe specific example group G3. The number of carbon atoms of the“unsubstituted alkylthio group” are 1 to 50, preferably 1 to 30, andmore preferably 1 to 18, unless otherwise specified.

Specific examples of the “aryloxy group” described herein include agroup represented by —O(G1), where G1 is the “aryl group” described inthe specific example group G1. The number of ring carbon atoms of the“unsubstituted aryloxy group” are 6 to 50, preferably 6 to 30, and morepreferably 6 to 18, unless otherwise specified.

Specific examples of the “arylthio group” described herein include agroup represented by —S(G1), where G1 is the “aryl group” described inthe specific example group G1. The number of ring carbon atoms of the“unsubstituted arylthio group” are 6 to 50, preferably 6 to 30, and morepreferably 6 to 18, unless otherwise specified.

Specific examples of the “aralkyl group” described herein include agroup represented by -(G3)-(G1), where G3 is the “alkyl group” describedin the specific example group G3, and G1 is the “aryl group” describedin the specific example group G1. Accordingly, the “aralkyl group” isone embodiment of the “substituted alkyl group” substituted by the “arylgroup”. The number of carbon atoms of the “unsubstituted aralkyl group,”which is the “unsubstituted alkyl group” substituted by the“unsubstituted aryl group,” are 7 to 50, preferably 7 to 30, and morepreferably 7 to 18, unless otherwise specified.

Specific example of the “aralkyl group” include a benzyl group, a1-phenylethyl group, a 2-phenylethyl group, a 1-phenylisopropyl group, a2-phenylisopropyl group, a phenyl-t-butyl group, an α-naphthylmethylgroup, a 1-α-naphthylethyl group, a 2-α-naphthylethyl group, a1-α-naphthylisopropyl group, a 2-α-naphthylisopropyl group, aβ-naphthylmethyl group, a 1-β-naphthylethyl group, a 2-β-naphthylethylgroup, a 1-β-naphthylisopropyl group, and a 2-β-naphthylisopropyl group.

The substituted or unsubstituted aryl group described herein is, unlessotherwise specified, preferably a phenyl group, a p-biphenyl group, am-biphenyl group, an o-biphenyl group, a p-terphenyl-4-yl group, ap-terphenyl-3-yl group, a p-terphenyl-2-yl group, a m-terphenyl-4-ylgroup, a m-terphenyl-3-yl group, a m-terphenyl-2-yl group, ano-terphenyl-4-yl group, an o-terphenyl-3-yl group, an o-terphenyl-2-ylgroup, a 1-naphthyl group, a 2-naphthyl group, an anthryl group, aphenanthryl group, a pyrenyl group, a chrysenyl group, a triphenylenylgroup, a fluorenyl group, a 9,9′-spirobifluorenyl group, a9,9-diphenylfluorenyl group, or the like.

The substituted or unsubstituted heterocyclic group described herein is,unless otherwise specified, preferably a pyridyl group, a pyrimidinylgroup, a triazinyl group, a quinolyl group, an isoquinolyl group, aquinazolinyl group, a benzimidazolyl group, a phenanthrolinyl group, acarbazolyl group (a 1-carbazolyl group, a 2-carbazolyl group, a3-carbazolyl group, a 4-carbazolyl group, or a 9-carbazolyl group), abenzocarbazolyl group, an azacarbazolyl group, a diazacarbazolyl group,a dibenzofuranyl group, a naphthobenzofuranyl group, anazadibenzofuranyl group, a diazadibenzofuranyl group, adibenzothiophenyl group, a naphthobenzothiophenyl group, anazadibenzothiophenyl group, a diazadibenzothiophenyl group, a(9-phenyl)carbazolyl group (a (9-phenyl)carbazol-1-yl group, a(9-phenyl)carbazol-2-yl group, a (9-phenyl)carbazol-3-yl group, or a(9-phenyl)carbazol-4-yl group), a (9-biphenylyl)carbazolyl group, a(9-phenyl)phenylcarbazolyl group, a diphenylcarbazole-9-yl group, aphenylcarbazol-9-yl group, a phenyltriazinyl group, abiphenylyltriazinyl group, diphenyltriazinyl group, aphenyldibenzofuranyl group, a phenyldibenzothiophenyl group, anindrocarbazolyl group, a pyrazinyl group, a pyridazinyl group, aquinazolinyl group, a cinnolinyl group, a phthalazinyl group, aquinoxalinyl group, a pyrrolyl group, an indolyl group, apyrrolo[3,2,1-jk]carbazolyl group, a furanyl group, a benzofuranylgroup, a thiophenyl group, a benzothiophenyl group, a pyrazolyl group,an imidazolyl group, a benzimidazolyl group, a triazolyl group, anoxazolyl group, a benzoxazolyl group, a thiazolyl group, abenzothiazolyl group, an isothiazolyl group, a benzisothiazolyl group, athiadiazolyl group, an isoxazolyl group, a benzisoxazolyl group, apyrrolidinyl group, a piperidinyl group, a piperazinyl group, animidazolidinyl group, an indro[3,2,1-jk]carbazolyl group, adibenzothiophenyl group, or the like.

The dibenzofuranyl group and the dibenzothiophenyl group as describedabove are specifically any group described below, unless otherwisespecified.

In the formulas (XY-76) to (XY-79), X_(B) is an oxygen atom or a sulfuratom.

The substituted or unsubstituted alkyl group described herein is, unlessotherwise specified, preferably a methyl group, an ethyl group, a propylgroup, an isopropyl group, a n-butyl group, an isobutyl group, a t-butylgroup, or the like.

The “substituted or unsubstituted arylene group” descried herein refersto a group in which the above-described “aryl group” is converted intodivalence, unless otherwise specified. Specific examples (specificexample group G12) of the “substituted or unsubstituted arylene group”include a group in which the “aryl group” described in the specificexample group G1 is converted into divalence. Namely, specific examples(specific example group G12) of the “substituted or unsubstitutedarylene group” refer to a group derived from the “aryl group” describedin specific example group G1 by removal of one hydrogen atom bonded tothe ring carbon atoms thereof.

Specific examples (specific example group G13) of the “substituted orunsubstituted divalent heterocyclic group” include a group in which the“heterocyclic group” described in the specific example group G2 isconverted into divalence. Namely, specific examples (specific examplegroup G13) of the “substituted or unsubstituted divalent heterocyclicgroup” refer to a group derived from the “heterocyclic group” describedin specific example group G2 by removal of one hydrogen atom bonded tothe ring atoms thereof.

Specific examples (specific example group G14) of the “substituted orunsubstituted alkylene group” include a group in which the “alkyl group”described in the specific example group G3 is converted into divalence.Namely, specific examples (specific example group G14) of the“substituted or unsubstituted alkylene group” refer to a group derivedfrom the “alkyl group” described in specific example group G3 by removalof one hydrogen atom bonded to the carbon atoms constituting the alkanestructure thereof.

The substituted or unsubstituted arylene group described herein is anygroup described below, unless otherwise specified.

In the formulas (XY-20) to (XY-29), (XY-83) and (XY-84), R₉₀₈ is asubstituent.

Then, m901 is an integer of 0 to 4, and when m901 is 2 or more, aplurality of R₉₀₈ may be the same with or different from each other.

In the formulas (XY-30) to (XY-40), R₉₀₉ is independently a hydrogenatom or a substituent. Two of R₉₀₉ may form a ring by bonding with eachother through a single bond.

In the formulas (XY-41) to (XY-46), R₉₁₀ is a substituent.

Then, m902 is an integer of 0 to 6. When m902 is 2 or more, a pluralityof R₉₁₀ may be the same with or different from each other.

The substituted or unsubstituted divalent heterocyclic group describedherein is preferably any group described below, unless otherwisespecified.

In the formulas (XY-50) to (XY-60), R₉₁₁ is a hydrogen atom or asubstituent.

In the formulas (XY-65) to (XY-75), X_(B) is an oxygen atom or a sulfuratom.

Herein, a case where “one or more sets of two or more groups adjacent toeach other form a substituted or unsubstituted and saturated orunsaturated ring by bonding with each other” will be described bytaking, as an example, a case of an anthracene compound represented bythe following formula (XY-80) in which a mother skeleton is ananthracene ring.

For example, two adjacent to each other into one set when “one or moresets of two or more groups adjacent to each other form the ring bybonding with each other” among R₉₂₁ to R₉₃₀ include R₉₂₁ and R₉₂₂, R₉₂₂and R₉₂₃, R₉₂₃ and R₉₂₄, R₉₂₄ and R₉₃₀, R₉₃₀ and R₉₂₅, R₉₂₅ and R₉₂₆,R₉₂₆ and R₉₂₇, R₉₂₇ and R₉₂₈, R₉₂₈ and R₉₂₉, and R₉₂₉ and R₉₂₁.

The above-described “one or more sets” means that two or more sets oftwo groups adjacent to each other may simultaneously form the ring. Forexample, a case where R₉₂₁ and R₉₂₂ forma ring A by bonding with eachother, and simultaneously R₉₂₅ and R₉₂₆ form a ring B by bonding witheach other is represented by the following formula (XY-81).

A case where “two or more groups adjacent to each other” form a ringmeans that, for example, R₉₂₁ and R₉₂₂ forma ring A by bonding with eachother, and R₉₂₂ and R₉₂₃ forma ring C by bonding with each other. A casewhere the ring A and ring C sharing R₉₂₂ are formed, in which the ring Aand the ring C are fused to the anthracene mother skeleton by three ofR₉₂₁ to R₉₂₃ adjacent to each other, is represented by the following(XY-82).

The rings A to C formed in the formulas (XY-81) and (XY-82) are asaturated or unsaturated ring.

A term “unsaturated ring” means an aromatic hydrocarbon ring or anaromatic heterocyclic ring. A term “saturated ring” means an aliphatichydrocarbon ring or an aliphatic heterocyclic ring.

For example, the ring A formed by R₉₂₁ and R₉₂₂ being bonded with eachother, represented by the formula (XY-81), means a ring formed by acarbon atom of the anthracene skeleton bonded with R₉₂₁, a carbon atomof the anthracene skeleton bonded with R₉₂₂, and one or more arbitraryelements. Specific examples include, when the ring A is formed by R₉₂₁and R₉₂₂, a case where an unsaturated ring is formed of a carbon atom ofan anthracene skeleton bonded with R₉₂₁, a carbon atom of the anthraceneskeleton bonded with R₉₂₂, and four carbon atoms, in which a ring formedby R₉₂₁ and R₉₂₂ is formed into a benzene ring. Further, when asaturated ring is formed, the ring is formed into a cydohexane ring.

Here, “arbitrary elements” are preferably a C element, a N element, an Oelement and a S element. In the arbitrary elements (for example, a caseof the C element or the N element), the bond(s) that is(are) notinvolved in the formation of the ring may be terminated by a hydrogenatom, or may be substituted by an arbitrary substituent. When the ringcontains the arbitrary elements other than the C element, the ring to beformed is a heterocyclic ring.

The number of “one or more arbitrary elements” forming the saturated orunsaturated ring is preferably 2 or more and 15 or less, more preferably3 or more and 12 or less, and further preferably 3 or more and 5 orless.

As specific examples of the aromatic hydrocarbon ring, a structure inwhich the aryl group described in specific example group G1 isterminated with a hydrogen atom may be mentioned.

As specific examples of the aromatic heterocyclic ring, a structure inwhich the aromatic heterocyclic group described in specific examplegroup G2 is terminated with a hydrogen atom may be mentioned.

As specific examples of the aliphatic hydrocarbon ring, a structure inwhich the cycloalkyl group described in specific example group G6 isterminated with a hydrogen atom may be mentioned.

When the above-described “saturated or unsaturated ring” has asubstituent, the substituent is an “arbitrary substituent” as describedbelow, for example. When the above-mentioned “saturated or unsaturatedring” has a substituent, specific examples of the substituent refer tothe substituents described in above-mentioned “the substituent describedherein”.

In one embodiment of this specification, the substituent (hereinafter,referred to as an “arbitrary substituent” in several cases) in the caseof the “substituted or unsubstituted” is a group selected from the groupconsisting of

-   an unsubstituted alkyl group including 1 to 50 carbon atoms,-   an unsubstituted alkenyl group including 2 to 50 carbon atoms,-   an unsubstituted alkynyl group including 2 to 50 carbon atoms,-   an unsubstituted cycloalkyl group including 3 to 50 ring carbon    atoms,-   —Si(R₉₀₁)(R₉₀₂)(R₉₀₃),-   —O—(R₉₀₄),-   —S—(R₉₀₅)-   N(R₉₀₆)(R₉₀₇)-   wherein,-   R₉₀₁ to R₉₀₇ are independently-   a hydrogen atom,-   a substituted or unsubstituted alkyl group including 1 to 50 carbon    atoms,-   a substituted or unsubstituted cycloalkyl group including 3 to 50    ring carbon atoms,-   a substituted or unsubstituted aryl group including 6 to 50 ring    carbon atoms, or-   a substituted or unsubstituted monovalent heterocyclic group    including 5 to 50 ring atoms; and when two or more of R₉₀₁ to R₉₀₇    exist, two or more of R₉₀₁ to R₉₀₇ may be the same with or different    from each other,-   a halogen atom, a cyano group, a nitro group,-   an unsubstituted aryl group including 6 to 50 ring carbon atoms, and-   an unsubstituted monovalent heterocyclic group including 5 to 50    ring atoms.

In one embodiment, the substituent in the case of “substituted orunsubstituted” is a group selected from the group consisting of

-   an alkyl group including 1 to 50 carbon atoms,-   an aryl group including 6 to 50 ring carbon atoms, and-   a monovalent heterocyclic group including 5 to 50 ring atoms.

In one embodiment, the substituent in the case of “substituted orunsubstituted” is a group selected from the group consisting of

-   an alkyl group including 1 to 18 carbon atoms,-   an aryl group including 6 to 18 ring carbon atoms, and-   a monovalent heterocyclic group including 5 to 18 ring atoms.

Specific examples of each group of the arbitrary substituent describedabove are as described above.

Herein, unless otherwise specified, the saturated or unsaturated ring(preferably substituted or unsubstituted and saturated or unsaturatedfive-membered or six-membered ring, more preferably a benzene ring) maybe formed by the arbitrary substituents adjacent to each other.

Herein, unless otherwise specified, the arbitrary substituent mayfurther have the substituent.

Specific examples of the substituent that the arbitrary substituentfurther has include to the ones same as the arbitrary substituentdescribed above.

[Organic Electroluminescence Device]

An organic electroluminescence device of an aspect of the inventionincludes: an anode, a cathode, and at least one emitting layer betweenthe cathode and the anode,

the emitting layer contains a first host material, a second hostmaterial, and a dopant material,

the first host material is a compound having at least one deuteriumatom, and

the emitting layer contains the first host material in the proportion of1% by mass or more.

Schematic configuration of the organic EL device according to a firstaspect of the invention will be explained referring to FIG. 1 .

An organic EL device 1A according to an aspect of the invention includesa substrate 2, an anode 3, a cathode 4, and organic layers 10 betweenthe anode 3 and the cathode 4. The organic layers 10 include an emittinglayer 5, an organic thin film layer 6 (a hole-injecting/-transportinglayer) between the anode 3 and the emitting layer 5, and an organic thinfilm layer 7 (an electron-injecting/-transporting layer) between theemitting layer 5 and the cathode 4.

The emitting layer 5 contains a first host material, a second hostmaterial, and a dopant material. The dopant material is preferably ablue emitting dopant.

The first host material has at least one deuterium atom, and the contentof the first host material in the entire emitting layer is in theproportion of 1% by mass or more. Since the content of the host materialhaving at least one deuterium atom is 1% by mass or more, the content ofthe “host material having at least one deuterium atom” contained in theemitting layer produced using only a single host material synthesizedusing a natural hydrogen atom (containing deuterium atoms at the naturalabundance ratio) is greatly exceeded. This content can be measuredusing, for example, mass spectrometry or ¹H-NMR analysis.

The inventors found that a configuration of a so-called co-host in whicha first host material having a deuterium atom and a second host materialare contained in one emitting layer increases the lifetime of an organicEL device.

In one embodiment, the second host material is a compound that does notsubstantially contain a deuterium atom. Here, the expression “does notsubstantially contain a deuterium atom” means that no deuterium atom iscontained or deuterium atoms may be contained to the natural abundanceratio dgree. The natural abundance ratio of deuterium atoms is, forexample, 0.015% or less.

In one embodiment, the emitting layer contains a second host material inthe proportion of 1% by mass or more as the content relative to theentire emitting layer. In one embodiment, the emitting layer contains asecond host material having no deuterium atom in the proportion of 1% bymass or more as the content relative to the entire emitting layer

In one embodiment, the emitting layer contains the first host materialin the proportion of 10% by mass or more as the content relative to theentire emitting layer. This content is, for example, 20% by mass ormore, 50% by mass or more, and 60% by mass or more.

Further, in one embodiment, the emitting layer contains the first hostmaterial in the proportion of 99% by mass or less as the contentrelative to the entire emitting layer.

In one embodiment, the emitting layer contains the second host materialin the proportion of 10% by mass or more as the content relative to theentire emitting layer.

Further, in one embodiment, the emitting layer contains the second hostmaterial in the proportion of 99 mass % or less as the content relativeto the entire emitting layer.

The mass ratio of the first host material having at least one deuteriumatom and the second host material having no deuterium atom is in therange of 1:99 to 99:1, preferably in the range of 10:90 to 90:10, andmore preferably in the range of 15:85 to 85:15. The mass ratio is, forexample, 20:80 to 80:20, 50:50 to 80:20, or 60:40 to 80:20.

The total content of the first and second host material in the emittinglayer is preferably 80% by mass or more and 99% by mass or less based onthe entire emitting layer.

The content of the dopant material in the emitting layer is preferably1% by mass or more and 20% by mass or less based on the entire emittinglayer.

The number of deuterium atoms in the first host material, which is acompound having at least one deuterium atom, is preferably from 1 to 50,and more preferably from 1 to 40.

The dopant material contained in the emitting layer is not limited, butthe emitting layer preferably does not contain a phosphorescent dopantmaterial. In this case, since the emitting layer contains a fluorescentdopant as a dopant, the emitting layer will bean emitting layer thatemits fluorescent light.

Examples of the “phosphorescent dopant materials” include aphosphorescent emissive metallic complex such as an iridium complex.

In one embodiment, the emitting layer does not contain a metalliccomplex.

In one embodiment, the emitting layer does not contain a phosphorescentemissive metallic complex.

In one embodiment, the emitting layer does not contain an iridiumcomplex.

Examples of the dopant materials suitable for an organic EL device of anaspect of the invention will be described later.

In one embodiment, the first host material is a compound having at leastone of an anthracene skeleton, a pyrene skeleton, a chrysene skeleton,and a fluorene skeleton.

In one embodiment, the first host material is a compound having ananthracene skeleton.

For example, in the case when the first host material having at leastone deuterium atom is a compound having an anthracene skeleton, adeuterium atom may be at any position of the compound. In other words, adeuterium atom may be bonded with any atom contained in the compound.

In one embodiment, the first host material is a compound having ananthracene skeleton, and having at least one deuterium atom bonded witha carbon atom on the anthracene skeleton.

In one embodiment, the first host material is a compound having ananthracene skeleton, and having at least one deuterium atom bonded witha carbon atom other than carbon atoms on the anthracene skeleton.

In one embodiment, the second host material is a compound having atleast one of an anthracene skeleton, a pyrene skeleton, a chryseneskeleton, and a fluorene skeleton.

In one embodiment, the chemical structure when all of the deuteriumatoms of the first host material are replaced with protium atoms isidentical to the chemical structure of the second host material.

The expression “the chemical structure when all of the deuterium atomsof the first host material are replaced with protium atoms is identicalto the chemical structure of the second host material” means that, forexample, a first host material having a deuterium atom and a second hostmaterial having no deuterium atom are represented by the same chemicalstructure except for the difference between a protium atom and adeuterium atom. For example, in two host materials of the followingexample, the chemical structure when deuterium atoms of the first hostmaterial are replaced with protium atoms is identical to the chemicalstructure of the second host material. In the first host material of thefollowing example, 8 deuterium atoms are bonded with carbon atoms on theanthracene skeleton, whereas in the second host material, no deuteriumatom is bonded with carbon atoms of the same position on anthraceneskeleton, and protium atoms are instead bonded therewith, but the secondhost material has otherwise the same chemical structure. However, thefirst host material and the second host material are not the samematerial but different materials, like the following example.

In one embodiment, the emitting layer may contain a first host material,a second host material, and a dopant material, and may further contain athird host material.

In one embodiment, the chemical structure when all of the deuteriumatoms of the first host material are replaced with protium atoms isdifferent from the chemical structure of the second host material.

An organic EL device according to a second aspect of the inventionfurther contains another emitting layer different from the emittinglayer.

In one embodiment, the organic EL device contains another emitting layerdifferent from the emitting layer, wherein the emitting layer and theanother emitting layer are directly adjacent to each other. Here, “theemitting layer” contains a first host material, a second host material,and a dopant material described above, wherein the first host materialhas at least one deuterium atom, and the first host material iscontained in the proportion of 1% by mass or more.

Another emitting layer may contain the same host material and dopantmaterial as the emitting layer, or may contain a host material and adopant material different from those contained in the emitting layer.Further, another emitting layer may be an emitting layer havingdifferent content and/or a different film thickness even if it containsthe same host material and dopant material.

Another emitting layer preferably does not contain a host materialhaving at least one deuterium atom.

Referring to FIG. 2 , a schematic configuration of one embodiment of anorganic EL device according to a second aspect of the invention will bedescribed.

An organic EL device 1B according to a second aspect of the inventionshown in FIG. 2 has a substrate 2, an anode 3, a cathode 4, and organiclayers 10 between the anode 3 and the cathode 4. The organic layers 10include an emitting layer 5, an organic thin film layer 6 (ahole-injecting/-transporting layer) between the anode 3 and the emittinglayer 5, and an organic thin film layer 7 (anelectron-injecting/-transporting layer) between the emitting layer 5 andthe cathode 4.

In the organic EL device 1B shown in FIG. 2 , another emitting layer 9is provided on the cathode side of the emitting layer 5, and theemitting layer 5 and the another emitting layer 9 are directly adjacentto each other.

The another emitting layer 9 may be provided directly adjacent to theanode side of the emitting layer 5.

The emitting layer 5 contains a first host material having at least onedeuterium atom.

The another emitting layer 9 is preferably an emitting layer containingno compound having at least one deuterium atom.

An organic EL device according to a third aspect of the inventioncontains two or more of the emitting layers.

In one embodiment, the organic EL device includes two of the emittinglayers and a charge-generating layer between the two of the emittinglayers.

Referring to FIG. 3 , a schematic configuration of one embodiment of anorganic EL device according to a third aspect of the invention will bedescribed.

An organic EL device 1C according to a third aspect of the inventionshown in FIG. 3 has a substrate 2, an anode 3, a cathode 4, and organiclayers 10 between the anode 3 and the cathode 4. The organic layers 10include a first emitting layer 5A, a second emitting layer 5B betweenthe first emitting layer 5A and the cathode 3, an organic thin filmlayer 6 (a hole-injecting/-transporting layer) between the anode 3 andthe first emitting layer 5A, and an organic thin film layer 7 (anelectron-injecting/-transporting layer) between the second emittinglayer 5B and the cathode 4. A charge-generating layer 8 is providedbetween the first emitting layer and the second emitting layer.

Both the first emitting layer 5A and the second emitting layer 5Bcontains a first host material, a second host material, and a dopantmaterial, wherein the first host material has at least one deuteriumatom and the emitting layer contains the first host material in theproportion of 1% by mass or more.

An organic EL device according to the third aspect of the invention hasa so-called tandem-type configuration, which has two or more emittinglayers. By having such a tandem-type configuration, the effect of highbrightness and long lifetime can be expected. It is also possible toproduce a white emitting device of simple structure.

In one embodiment, the host material having at least one deuterium atomis a compound represented by the following formula (1).

In the formula (1),

R₁ to R₈ are independently

-   a hydrogen atom,-   a substituted or unsubstituted alkyl group including 1 to 50 carbon    atoms,-   a substituted or unsubstituted alkenyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted alkynyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted cycloalkyl group including 3 to 50    ring carbon atoms,-   —Si(R₉₀₁)(R₉₀₂)(R₉₀₃),-   —O—(R₉₀₄),-   —S—(R₉₀₅),-   —N(R₉₀₆)(R₉₀₇),-   a halogen atom, a cyano group, a nitro group,-   a substituted or unsubstituted aryl group including 6 to 50 ring    carbon atoms, or-   a substituted or unsubstituted monovalent heterocyclic group    including 5 to 50 ring atoms;

R₉₀₁ to R₉₀₇ are independently

-   a hydrogen atom,-   a substituted or unsubstituted alkyl group including 1 to 50 carbon    atoms,-   a substituted or unsubstituted cycloalkyl group including 3 to 50    ring carbon atoms,-   a substituted or unsubstituted aryl group including 6 to 50 ring    carbon atoms, or-   a substituted or unsubstituted monovalent heterocyclic group    including 5 to 50 ring atoms;

when two or more of each of R₉₀₁ to R₉₀₇ are present, the two or more ofeach of R₉₀₁ to R₉₀₇ are the same as or different from each other;

adjacent two or more of R₁ to R₄, and adjacent two or more of R₅ to R₈do not form a ring by bonding with each other;

L₁ and L₂ are independently

-   a single bond,-   a substituted or unsubstituted arylene group including 6 to 30 ring    carbon atoms, or-   a substituted or unsubstituted divalent heterocyclic group including    5 to 30 ring atoms;

Ar₁ and Ar₂ are independently

-   a substituted or unsubstituted aryl group including 6 to 50 ring    carbon atoms, or-   a substituted or unsubstituted monovalent heterocyclic group    including 5 to 50 ring atoms;

at least one hydrogen atom selected from the following is a deuteriumatom:

hydrogen atoms of R₁ to R₈ in the case where they are hydrogen atoms,and

hydrogen atoms possessed by one or more groups selected from R₁ to R₈which are not hydrogen atoms, L₁ which is not a single bond, L₂ which isnot a single bond, and Ar₁ and Ar₂.

The compound represented by the formula (1) has one or more deuteriumatoms in any position in the molecule.

In the formula (1), at least one of R₁ to R₈ is a deuterium atom, or atleast one hydrogen atom possessed by one or more groups selected from R₁to R₈ which are not hydrogen atoms, L₁ which is not a single bond, L₂which is not a single bond, Ar₁, and Ar₂ is a deuterium atom.Alternatively, at least one of R₁ to R₈ is a deuterium atom, as well asat least one hydrogen atom possessed by one or more groups selected fromR₁ to R₈ which are not hydrogen atoms, L₁ which is not a single bond, L₂which is not a single bond, Ar₁, and Ar₂ is a deuterium atom.

The presence of a deuterium atom in a compound is confirmed by massspectrometry or ¹H-NMR analysis. The bonding position of the deuteriumatom in the compound is identified by ¹H-NMR analysis. Specifically, itcan be confirmed by the following method.

A target compound is subjected to mass spectrometry, and if themolecular weight is increased by 1 compared to the reference compound inwhich all hydrogen atoms are protium atoms, it can be confirmed that thetarget compound contains one deuterium atom. In addition, the number ofdeuterium atoms in the molecule can be confirmed by the integral valueobtained by ¹H-NMR analysis of the target compound, since a deuteriumatom gives no signal in ¹H-NMR analysis. In addition, the bindingposition of a deuterium atom can be identified by subjecting the targetcompound to ¹H-NMR analysis, and assigning the obtained signals.

In an organic EL device according to an aspect of the invention, basedon the total amount of a compound represented by the formula (1) and acompound having the same structure as the compound represented by theformula (1) except that only protium atoms are contained as hydrogenatoms (hereinafter also referred to as a “protium compound”), thecontent proportion of the latter in the emitting layer is preferably 99mol % or less. The proportion of the protium compound is confirmed bymass spectrometry.

All of R₁ to R₈ may be deuterium atoms, or some (e.g. one or two) of R₁to R₈ may be deuterium atoms.

R₁ to R₈ which are not deuterium atoms are preferably protium atoms.

A first aspect of the compound represented by the formula (1) is acompound represented by the following formula (1A).

In the formula (1A),

R₁ to R₈ are independently

-   a hydrogen atom,-   a substituted or unsubstituted alkyl group including 1 to 50 carbon    atoms,-   a substituted or unsubstituted alkenyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted alkynyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted cycloalkyl group including 3 to 50    ring carbon atoms,-   —Si(R₉₀₁)(R₉₀₂)(R₉₀₃),-   —O—(R₉₀₄),-   —S—(R₉₀₅),-   —N(R₉₀₆)(R₉₀₇),-   a halogen atom, a cyano group, a nitro group,-   a substituted or unsubstituted aryl group including 6 to 50 ring    carbon atoms, or-   a substituted or unsubstituted monovalent heterocyclic group    including 5 to 50 ring atoms.

R₉₀₁ to R₉₀₇ are independently

-   a hydrogen atom,-   a substituted or unsubstituted alkyl group including 1 to 50 carbon    atoms,-   a substituted or unsubstituted cycloalkyl group including 3 to 50    ring carbon atoms,-   a substituted or unsubstituted aryl group including 6 to 50 ring    carbon atoms, or-   a substituted or unsubstituted monovalent heterocyclic group    including 5 to 50 ring atoms.

When two or more of each of R₉₀₁ to R₉₀₇ are present, the two or more ofeach of R₉₀₁ to R₉₀₇ may be the same as or different from each other.

At least one of R₁ to R₈ is a deuterium atom.

Adjacent two or more of R₁ to R₄, and adjacent two or more of R₅ to R₈do not form a ring by bonding with each other.

L_(1A) and L_(2A) are independently

-   a single bond,-   a substituted or unsubstituted phenylene group,-   a substituted or unsubstituted naphthylene group,-   a substituted or unsubstituted biphenyldiyl group,-   a substituted or unsubstituted terphenylene group,-   a substituted or unsubstituted anthrylene group, or-   a substituted or unsubstituted phenanthrylene group.

Ar_(1A) and Ar_(2A) are independently

-   a substituted or unsubstituted phenyl group,-   a substituted or unsubstituted naphthyl group,-   a substituted or unsubstituted biphenyl group,-   a substituted or unsubstituted terphenyl group,-   a substituted or unsubstituted anthryl group, or-   a substituted or unsubstituted phenanthryl group.

The substituent when L_(1A), L_(2A), Ar_(1A), and Ar_(2A) have asubstituent is

-   an alkyl group including 1 to 50 carbon atoms,-   an alkenyl group including 2 to 50 carbon atoms,-   an alkynyl group including 2 to 50 carbon atoms,-   a cycloalkyl group including 3 to 50 ring carbon atoms,-   an alkylsilyl group including 1 to 50 carbon atoms,-   a halogen atom, or-   a cyano group.

All of R₁ to R₈ may be deuterium atoms, or some (e.g. one or two) of R₁to R₈ may be deuterium atoms.

R₁ to R₈ which are not deuterium atoms are preferably hydrogen atoms(protium atoms).

In one embodiment, at least one hydrogen atom possessed by one or moreselected from the group consisting of L_(1A) and L_(2A) is a deuteriumatom. Specifically, in one embodiment, one or more selected from thegroup consisting of L_(1A) and L_(2A) is

-   an unsubstituted phenylene group in which at least one of the    hydrogen atom is a deuterium atom,-   an unsubstituted naphthylene group in which at least one of the    hydrogen atom is a deuterium atom,-   an unsubstituted biphenyldiyl group in which at least one of the    hydrogen atom is a deuterium atom,-   an unsubstituted terphenylene group in which at least one of the    hydrogen atom is a deuterium atom,-   an unsubstituted anthrylene group in which at least one of the    hydrogen atom is a deuterium atom, or-   an unsubstituted phenanthrylene group in which at least one of the    hydrogen atom is a deuterium atom.

In one embodiment, L_(1A) and L_(2A) are independently a single bond, asubstituted or unsubstituted phenylene group, or a substituted orunsubstituted naphthylene group. Preferably, at least one of L_(1A) andL_(2A) is a single bond.

In one embodiment, at least one hydrogen atom possessed by one or moreselected from the group consisting of Ar_(1A) and Ar_(2A) is deuteriumatom. Specifically, in one embodiment, one or more selected from thegroup consisting of Ar_(1A) and Ar_(2A) is

-   an unsubstituted phenyl group in which at least one of the hydrogen    atoms is a deuterium atom,-   an unsubstituted naphthyl group in which at least one of the    hydrogen atoms is a deuterium atom,-   an unsubstituted biphenyl group in which at least one of the    hydrogen atoms is a deuterium atom,-   an unsubstituted terphenyl group in which at least one of the    hydrogen atoms is a deuterium atom,-   an unsubstituted anthryl group in which at least one of the hydrogen    atoms is a deuterium atom, or-   an unsubstituted phenanthryl group in which at least one of the    hydrogen atoms is a deuterium atom.

In one embodiment, Ar_(1A) and Ar_(2A) are independently a substitutedor unsubstituted phenyl group, a substituted or unsubstituted naphthylgroup, or a substituted or unsubstituted phenanthryl group.

The compound represented by the formula (1A) within the scope of theinvention can be synthesized in accordance with the synthetic methodsdescribed in Examples by using known alternative reactions or rawmaterials tailored to the target compound.

Specific examples of the compound represented by the formula (1A)include the following compounds. In the following specific compound, “D”represents a deuterium atom.

A second aspect of the compound represented by the formula (1) is acompound represented by the following formula (1B).

-   In the formula (1B),-   R₁ to R₈ are independently-   a hydrogen atom,-   a substituted or unsubstituted alkyl group including 1 to 50 carbon    atoms,-   a substituted or unsubstituted alkenyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted alkynyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted cycloalkyl group including 3 to 50    ring carbon atoms,-   —Si(R₉₀₁)(R₉₀₂)(R₉₀₃),-   —O—(R₉₀₄),-   —S—(R₉₀₅),-   —N(R₉₀₆)(R₉₀₇),-   a halogen atom, a cyano group, a nitro group,-   a substituted or unsubstituted aryl group including 6 to 50 ring    carbon atoms, or-   a substituted or unsubstituted monovalent heterocyclic group    including 5 to 50 ring atoms.

R₉₀₁ to R₉₀₇ are independently

-   a hydrogen atom,-   a substituted or unsubstituted alkyl group including 1 to 50 carbon    atoms,-   a substituted or unsubstituted cycloalkyl group including 3 to 50    ring carbon atoms,-   a substituted or unsubstituted aryl group including 6 to 50 ring    carbon atoms, or-   a substituted or unsubstituted monovalent heterocyclic group    including 5 to 50 ring atoms.

When two or more of each of R₉₀₁ to R₉₀₇ are present, the two or more ofeach of R₉₀₁ to R₉₀₇ may be the same as or different from each other.

At least one of R₁ to R₈ is a deuterium atom.

Adjacent two or more of R₁ to R₄, and adjacent two or more of R₅ to R₈do not form a ring by bonding with each other.

L_(1B) and L_(2B) are independently

-   a single bond,-   a substituted or unsubstituted arylene group including 6 to 30 ring    carbon atoms, or-   a substituted or unsubstituted divalent heterocyclic group including    5 to 30 ring atoms.

Ar_(2B) is

-   a substituted or unsubstituted aryl group including 6 to 50 ring    carbon atoms, or-   a substituted or unsubstituted monovalent heterocyclic group    including 5 to 50 ring atoms.

One of R_(11B) to R_(18B) is a single bond which bonds with L_(1B).

R_(11B) to R_(18B) which are not a single bond which bonds with L_(1B)are independently

-   a hydrogen atom,-   a substituted or unsubstituted alkyl group including 1 to 50 carbon    atoms,-   a substituted or unsubstituted alkenyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted alkynyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted cycloalkyl group including 3 to 50    ring carbon atoms,-   —Si(R₉₀₁)(R₉₀₂)(R₉₀₃),-   —O—(R₉₀₄),-   —S—(R₉₀₅),-   —N(R₉₀₆)(R₉₀₇),-   a halogen atom, a cyano group, a nitro group,-   a substituted or unsubstituted aryl group including 6 to 50 ring    carbon atoms, or-   a substituted or unsubstituted monovalent heterocyclic group    including 5 to 50 ring atoms.

R₉₀₁ to R₉₀₇ are as defined in R₁ to R₈.

Adjacent two or more of R_(11B) to R_(18B) do not form a ring by bondingwith each other.

All of R₁ to R₈ may be deuterium atoms, or some (e.g. one or two) of R₁to R₈ may be deuterium atoms.

R₁ to R₈ that are not deuterium atoms are preferably hydrogen atoms(protium atoms).

In one embodiment, at least one hydrogen atom of one or more selectedfrom the group consisting of L_(1B) and L_(2B) is a deuterium atom.Specifically, in one embodiment, one or more selected from the groupconsisting of L_(1B) and L_(2B) is an unsubstituted arylene groupincluding 6 to 30 ring carbon atoms in which at least one of thehydrogen atoms is a deuterium atom, or an unsubstituted divalentheterocyclic group including 5 to 30 ring atoms in which at least one ofthe hydrogen atoms is a deuterium atom.

In one embodiment, L_(1B) and L_(2B) are independently a single bond, ora substituted or unsubstituted arylene group including 6 to 14 ringcarbon atoms. Preferably, at least one of L_(1B) and L_(2B) is a singlebond.

In one embodiment, R_(11B) to R_(18B) which are not a single bond whichbonds with L_(1B) are hydrogen atoms.

In one embodiment, at least one of R_(11B) to R_(18B) which are not asingle bond which bonds with L_(1B) is a deuterium atom.

In one embodiment, at least one hydrogen atom possessed by Ar_(2B) is adeuterium atom.

Specifically, in one embodiment, Ar_(2B) is an unsubstituted aryl groupincluding 6 to 50 ring carbon atoms in which at least one of thehydrogen atoms is a deuterium atom, or an unsubstituted monovalentheterocyclic group including 5 to 50 ring atoms in which at least one ofthe hydrogen atoms is a deuterium atom.

Ar_(2B) is preferably a substituted or unsubstituted aryl groupincluding 6 to 50 ring carbon atoms, and more preferably selected fromthe groups represented by each of the following formulas (a1B) to (a4B).

In the formulas (a1B) to (a4B), “*” is a single bond which bonds withL_(2B).

R_(21B) is

-   a halogen atom, a cyano group, a nitro group,-   a substituted or unsubstituted alkyl group including 1 to 50 carbon    atoms,-   a substituted or unsubstituted alkenyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted alkynyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted cycloalkyl group including 3 to 50    ring carbon atoms,-   —Si(R₉₀₁)(R₉₀₂)(R₉₀₃),-   —O—(R₉₀₄),-   —S—(R₉₀₅),-   —N(R₉₀₆)(R₉₀₇),-   a substituted or unsubstituted aryl group including 6 to 50 ring    carbon atoms, or-   a substituted or unsubstituted monovalent heterocyclic group    including 5 to 50 ring atoms.

R₉₀₁ to R₉₀₇ are as defined in the formula (1).

m1B is an integer of 0 to 4.

m2B is an integer of 0 to 5.

m3B is an integer of 0 to 7.

When m1B to m3B are each 2 or more, a plurality of R_(21B)'s may be thesame as or different from each other.

When m1B to m3B are each 2 or more, a plurality of adjacent R_(21B)'sform a substituted or unsubstituted, saturated or unsaturated ring bybonding with each other, or do not form a substituted or unsubstitutedsaturated or unsaturated ring.

L_(1B) and L_(2B) are preferably independently a single bond, or asubstituted or unsubstituted arylene group including 6 to 14 ring carbonatoms. Preferably, at least one of L_(1B) and L_(2B) is a single bond.

In one embodiment, the compound represented by the formula (1B) is acompound represented by the following formula (1B-1).

In the formula (1B-1), R₁ to R₈, Ar_(2B), L_(1B) and L_(2B) are asdefined in the formula (1B).

In one embodiment, the compound represented by the formula (1B) is acompound represented by the following formula (1B-2).

In the formula (1B-2), Ar_(2B), 11B, and L_(2B) are as defined in theformula (1B).

The compound represented by the formula (1B) can be synthesized inaccordance with the synthetic methods described in Examples by usingknown alternative reactions or raw materials tailored to the targetcompound.

Specific examples of the compound represented by the formula (1B) areshown below. In the following specific examples, “D” represents adeuterium atom.

A third aspect of the compound represented by the formula (1) is acompound represented by the following formula (1C).

In the formula (1C),

R₁ to R₈ are independently

-   a hydrogen atom,-   a substituted or unsubstituted alkyl group including 1 to 50 carbon    atoms,-   a substituted or unsubstituted alkenyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted alkynyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted cycloalkyl group including 3 to 50    ring carbon atoms,-   —Si(R₉₀₁)(R₉₀₂)(R₉₀₃),-   —O—(R₉₀₄),-   —S—(R₉₀₅),-   —N(R₉₀₆)(R₉₀₇),-   a halogen atom, a cyano group, a nitro group,-   a substituted or unsubstituted aryl group including 6 to 50 ring    carbon atoms, or-   a substituted or unsubstituted monovalent heterocyclic group    including 5 to 50 ring atoms.

R₉₀₁ to R₉₀₇ are independently

-   a hydrogen atom,-   a substituted or unsubstituted alkyl group including 1 to 50 carbon    atoms,-   a substituted or unsubstituted cycloalkyl group including 3 to 50    ring carbon atoms,-   a substituted or unsubstituted aryl group including 6 to 50 ring    carbon atoms, or-   a substituted or unsubstituted monovalent heterocyclic group    including 5 to 50 ring atoms.

When two or more of each of R₉₀₁ to R₉₀₇ are present, the two or more ofeach of R₉₀₁ to R₉₀₇ may be the same as or different from each other

At least one of R₁ to R₈ is a deuterium atom.

Adjacent two or more of R₁ to R₄, and adjacent two or more of R₅ to R₈do not form a ring by bonding with each other.

L_(1C) and L_(2C) are independently

-   a single bond,-   a substituted or unsubstituted arylene group including 6 to 30 ring    carbon atoms, or-   a substituted or unsubstituted divalent heterocyclic group including    5 to 30 ring atoms.

Ar_(2C) is

-   a substituted or unsubstituted aryl group including 6 to 50 ring    carbon atoms, or-   a substituted or unsubstituted monovalent heterocyclic group    including 5 to 50 ring atoms.

Ar_(1C) is a monovalent group represented by the following formula (2C),(3C) or (4C).

In the formulas (2C) to (4C),

one or more sets of adjacent two of R_(15C) to R_(20C) form asubstituted or unsubstituted, saturated or unsaturated ring by bondingwith each other, or do not form a substituted or unsubstituted,saturated or unsaturated ring.

In the case when one or more sets of adjacent two of R_(15C) to R_(20C)do not form a substituted or unsubstituted, saturated or unsaturatedring by bonding with each other, one of R_(11C) to R_(20C) is a singlebond which bonds with L_(1C).

In the case when one or more sets of adjacent two of R_(15C) to R_(20C)form a substituted or unsubstituted, saturated or unsaturated ring bybonding with each other, one of R_(15C) to R_(20C) and R_(11C) toR_(14C) which do not form the substituted or unsubstituted, saturated orunsaturated ring is a single bond which bonds with L_(1C).

R_(11C) to R_(20C) which do not form the substituted or unsubstituted,saturated or unsaturated ring, and which is not a single bond whichbonds with L_(1C) are independently

-   a hydrogen atom,-   a substituted or unsubstituted alkyl group including 1 to 50 carbon    atoms,-   a substituted or unsubstituted alkenyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted alkynyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted cycloalkyl group including 3 to 50    ring carbon atoms,-   —Si(R₉₀₁)(R₉₀₂)(R₉₀₃),-   —O—(R₉₀₄),-   —S—(R₉₀₅),-   —N(R₉₀₆)(R₉₀₇),-   a halogen atom, a cyano group, a nitro group,-   a substituted or unsubstituted aryl group including 6 to 50 ring    carbon atoms, or a substituted or unsubstituted monovalent    heterocyclic group including 5 to 50 ring atoms.

R₉₀₁ to R₉₀₇ are as defined in the formula (1C).

All of R₁ to R₈ may be deuterium atoms, or some (e.g. one or two) of R₁to R₈ may be deuterium atoms.

R₁ to R₈ which are not deuterium atoms are preferably hydrogen atoms(protium atoms).

In one embodiment, at least one hydrogen atom possessed by one or moreselected from the group consisting of L_(1C) and L_(2C) is a deuteriumatom. Specifically, in one embodiment, one or more selected from thegroup consisting of L_(1C) and L_(2C) is an unsubstituted arylene groupincluding 6 to 30 ring carbon atoms in which at least one of thehydrogen atoms is a deuterium atom, or an unsubstituted divalentheterocyclic group including 5 to 30 ring atoms in which at least one ofthe hydrogen atoms is a deuterium atom.

In one embodiment, L_(1C) and L_(2C) are independently a single bond, ora substituted or unsubstituted arylene group including 6 to 14 ringcarbon atoms. Preferably, at least one of L_(1C) and L_(2C) is a singlebond.

In one embodiment, any of R_(11C) to R_(14C) in the formulas (2C) to(4C) is a single bond which bonds with L_(1C).

In one embodiment, one or more sets of two adjacent of R_(15C) toR_(20C) in the formulas (2C) to (4C) do not form a substituted orunsubstituted, saturated or unsaturated ring by bonding with each other.

In one embodiment, R_(11C) to R_(20C) in the formulas (2C) to (4C),which are not a single bond which bonds with L_(1C) and do notcontribute to ring formation, are preferably hydrogen atoms.

In one embodiment, at least one of R_(11C) to R_(20C) in the formulas(2C) to (4C), which are not a single bond which bonds with L_(1C) and donot contribute to ring formation, is a deuterium atom.

In one embodiment, at least one hydrogen atom possessed by Ar_(2C) is adeuterium atom.

Specifically, in one embodiment, Ar_(2C) is an unsubstituted aryl groupincluding 6 to 50 ring carbon atoms in which at least one of thehydrogen atoms is a deuterium atom, or an unsubstituted monovalentheterocyclic group including 5 to 50 ring atoms in which at least one ofthe hydrogen atoms is a deuterium atom.

Ar_(2C) is preferably a substituted or unsubstituted aryl groupincluding 6 to 50 ring carbon atoms, and more preferably selected fromthe groups represented by each of the following formulas (a1C) to (a4C).

In the formulas (a1C) to (a4C), “*” is a single bond which bonds withL_(2C).

R_(21C) is

-   a halogen atom, a cyano group, a nitro group,-   a substituted or unsubstituted alkyl group including 1 to 50 carbon    atoms,-   a substituted or unsubstituted alkenyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted alkynyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted cycloalkyl group including 3 to 50    ring carbon atoms,-   —Si(R₉₀₁)(R₉₀₂)(R₉₀₃),-   —O—(R₉₀₄),-   —S—(R₉₀₅),-   —N(R₉₀₆)(R₉₀₇),-   a substituted or unsubstituted aryl group including 6 to 50 ring    carbon atoms, or-   a substituted or unsubstituted monovalent heterocyclic group    including 5 to 50 ring atoms.

R₉₀₁ to R₉₀₇ are as defined in the formula (1C).

m1C is an integer of 0 to 4.

m2C is an integer of 0 to 5.

m3C is an integer of 0 to 7.

When m1C to m3C are each 2 or more, a plurality of R_(21C)'s may be thesame as or different from each other.

When m1C to m3C are each 2 or more, a plurality of adjacent R_(21C)'sform a substituted or unsubstituted, saturated or unsaturated ring bybonding with each other, or do not form a substituted or unsubstituted,saturated or unsaturated ring.

L_(1C) and L_(2C) are preferably independently a single bond, or asubstituted or unsubstituted arylene group including 6 to 14 ring carbonatoms. Preferably, at least one of L_(1C) and L_(2C) is a single bond.

In one embodiment, the compound represented by the formula (1C) is acompound represented by any one of the following formulas (1C-1) to(1C-3).

In the formula (1C-1) to (1C-3), R₁ to R₈, Ar_(2C), L_(1C), and L_(2C)are as defined in the formula (1C).

In one embodiment, the compound represented by the formula (1C) is acompound represented by any one of the following formulas (1C-11) to(1C-13).

In the formula (1C-11) to (1C-13), Ar_(2C), L_(1C), and L_(2C) are asdefined in the formula (1C).

The compound represented by the formula (1C) can be synthesized inaccordance with the synthetic methods described in Examples by usingknown alternative reactions or raw materials tailored to the targetcompound.

Specific examples of the compound represented by the formula (1C) areshown below. In the following specific examples, “D” represents adeuterium atom.

The dopant material is not particularly limited, but preferably does notinclude a phosphorescent dopant material as described above.

Examples of the dopant materials include compounds represented by eachof the following formulas (11), (21), (31), (41), (51), (61), (71),(81), and (91), and the like. Preferably, the dopant material is acompound represented by the following formula (11).

(Compound Represented by the Formula (11))

A compound represented by the formula (11) will be described.

In the formula (11),

one or more sets of adjacent two or more of R₁₀₁ to R₁₁₀ form asubstituted or unsubstituted, saturated or unsaturated ring by bondingwith each other, or do not form a substituted or unsubstituted,saturated or unsaturated ring.

At least one of R₁₀₁ to R₁₁₀ is a monovalent group represented by thefollowing formula (12).

R₁₀₁ to R₁₁₀ which do not form a substituted or unsubstituted, saturatedor unsaturated ring, and are not a monovalent group represented by thefollowing formula (12) are independently

-   a hydrogen atom,-   a substituted or unsubstituted alkyl group including 1 to 50 carbon    atoms,-   a substituted or unsubstituted alkenyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted alkynyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted cycloalkyl group including 3 to 50    ring carbon atoms,-   —Si(R₉₀₁)(R₉₀₂)(R₉₀₃),-   —O—(R₉₀₄),-   —S—(R₉₀₅),-   —N(R₉₀₆)(R₉₀₇),-   a halogen atom, a cyano group, a nitro group,-   a substituted or unsubstituted aryl group including 6 to 50 ring    carbon atoms, or-   a substituted or unsubstituted monovalent heterocyclic group    including 5 to 50 ring atoms.

R₉₀₁ to R₉₀₇ are as defined in the formula (1).

In the formula (12), Ar₁₀₁ and Ar₁₀₂ are independently a substituted orunsubstituted aryl group including 6 to 50 ring carbon atoms, or asubstituted or unsubstituted monovalent heterocyclic group including 5to 50 ring atoms.

L₁₀₁ to L₁₀₃ are independently

-   a single bond,-   a substituted or unsubstituted arylene group including 6 to 30 ring    carbon atoms, or-   a substituted or unsubstituted divalent heterocyclic group including    5 to 30 ring atoms.

In the formula (11), it is preferable that two of R₁₀₁ to R₁₁₀ be groupsrepresented by the formula (12).

In one embodiment, the compound represented by the formula (11) is acompound represented by the following formula (13).

In the formula (13), R₁₁₁ to R₁₁₈ is the same as R₁₀₁ to R₁₁₀ in theformula (11) which are not a monovalent group represented by the formula(12). Ar₁₀₁, Ar₁₀₂, L₁₀₁, L₁₀₂, and L₁₀₃ are as defined in the formula(12).

In the formula (11), L₁₀₁ is preferably a single bond, and L₁₀₂ and L₁₀₃are preferably single bonds.

In one embodiment, the compound represented by the formula (11) is acompound represented by the following formula (14) or (15).

In the formula (14), R₁₁₁ to R₁₁₈ are as defined in the formula (13).Ar₁₀₁, Ar₁₀₂, L₁₀₂, and L₁₀₃ are as defined in the formula (12).

In the formula (15), R₁₁₁ to R₁₁₈ are as defined in the formula (13).Ar₁₀₁ and Ar₁₀₂ are as defined in the formula (12).

In the formula (12) in the formula (11), at least one of Ar₁₀₁ and Ar₁₀₂is preferably a group represented by the following formula (16).

In the formula (16),

X₁₀₁ represents an oxygen atom or a sulfur atom.

one or more sets of adjacent two or more of R₁₂₁ to R₁₂₇ form asubstituted or unsubstituted, saturated or unsaturated ring by bondingwith each other, or do not form a substituted or unsubstituted,saturated or unsaturated ring.

R₁₂₁ to R₁₂₇ which do not form the substituted or unsubstituted,saturated or unsaturated ring are independently

-   a hydrogen atom,-   a substituted or unsubstituted alkyl group including 1 to 50 carbon    atoms,-   a substituted or unsubstituted alkenyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted alkynyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted cycloalkyl group including 3 to 50    ring carbon atoms,-   —Si(R₉₀₁)(R₉₀₂)(R₉₀₃),-   —O—(R₉₀₄),-   —S—(R₉₀₅),-   —N(R₉₀₆)(R₉₀₇),-   a halogen atom, a cyano group, a nitro group,-   a substituted or unsubstituted aryl group including 6 to 50 ring    carbon atoms, or-   a substituted or unsubstituted monovalent heterocyclic group    including 5 to 50 ring atoms.

R₉₀₁ to R₉₀₇ are as defined in the formula (1).

Preferably, X₁₀₁ is an oxygen atom.

At least one of R₁₂₁ to R₁₂₇ is

-   a substituted or unsubstituted alkyl group including 1 to 50 carbon    atoms,-   a substituted or unsubstituted alkenyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted alkynyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted cycloalkyl group including 3 to 50    ring carbon atoms,-   a substituted or unsubstituted aryl group including 6 to 50 ring    carbon atoms, or-   a substituted or unsubstituted monovalent heterocyclic group    including 5 to 50 ring atoms.

In the formula (11) (formula (12)), it is preferable that Ar₁₀₁ be agroup represented by the formula (16), and that Ar₁₀₂ be a substitutedor unsubstituted aryl group including 6 to 50 ring carbon atoms.

In one embodiment, the compound represented by the formula (11) is acompound represented by the following formula (17).

In the formula (17), R₁₁₁ to R₁₁₈ are as defined in the formula (13).R₁₂₁ to R₁₂₇ is as defined in the formula (16).

R₁₃₁ to R₁₃₅ are independently

-   a hydrogen atom,-   a substituted or unsubstituted alkyl group including 1 to 50 carbon    atoms,-   a substituted or unsubstituted alkenyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted alkynyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted cycloalkyl group including 3 to 50    ring carbon atoms,-   —Si(R₉₀₁)(R₉₀₂)(R₉₀₃),-   —O—(R₉₀₄),-   —S—(R₉₀₅),-   —N(R₉₀₆)(R₉₀₇),-   a halogen atom, a cyano group, a nitro group,-   a substituted or unsubstituted aryl group including 6 to 50 ring    carbon atoms, or-   a substituted or unsubstituted monovalent heterocyclic group    including 5 to 50 ring atoms.

R₉₀₁ to R₉₀₇ are as defined in the formula (1).

Specific examples of the compound represented by the formula (11)include, for example, compounds shown below In the following specificexamples, “Me” represents a methyl group.

(Compound Represented by the Formula (21))

A compound represented by the formula (21) will be described.

In the formula (21),

Z's are independently CR_(a) or N.

Ring A1 and ring A2 are independently a substituted or unsubstitutedaromatic hydrocarbon ring including 6 to 50 ring carbon atoms, or asubstituted or unsubstituted heterocyclic ring including 5 to 50 ringatoms.

When a plurality of R_(a)'s are present, one or more sets of adjacenttwo or more of the plurality of R_(a)'s form a substituted orunsubstituted, saturated or unsaturated ring by bonding with each other,or do not form a substituted or unsubstituted, saturated or unsaturatedring.

When a plurality of R_(b)'s are present, one or more sets of adjacenttwo or more of the plurality of R_(b)'s form a substituted orunsubstituted, saturated or unsaturated ring by bonding with each other,or do not form a substituted or unsubstituted, saturated or unsaturatedring.

When a plurality of R_(c)'s are present, one or more sets of adjacenttwo or more of the plurality of R_(c)'s form a substituted orunsubstituted, saturated or unsaturated ring by bonding with each other,or do not form a substituted or unsubstituted, saturated or unsaturatedring.

n21 and n22 are independently an integer of 0 to 4.

R_(a) to R_(c) which do not form the substituted or unsubstituted,saturated or unsaturated ring are independently

-   a hydrogen atom,-   a substituted or unsubstituted alkyl group including 1 to 50 carbon    atoms,-   a substituted or unsubstituted alkenyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted alkynyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted cycloalkyl group including 3 to 50    ring carbon atoms,-   —Si(R₉₀₁)(R₉₀₂)(R₉₀₃),-   —O—(R₉₀₄),-   —S—(R₉₀₅),-   —N(R₉₀₆)(R₉₀₇),-   a halogen atom, a cyano group, a nitro group,-   a substituted or unsubstituted aryl group including 6 to 50 ring    carbon atoms, or-   a substituted or unsubstituted monovalent heterocyclic group    including 5 to 50 ring atoms.

R₉₀₁ to R₉₀₇ are as defined in the formula (1).

The “aromatic hydrocarbon rings” for the ring A1 and the ring A2 eachhave the same structure as the compound in which a hydrogen atom isintroduced into the “aryl group” described above. The “aromatichydrocarbon rings” for the ring A1 and the ring A2 each include twocarbon atoms on the central fused bicyclic structure of the formula (21)as ring atoms. Specific examples of the “substituted or unsubstitutedaromatic hydrocarbon rings including 6 to 50 ring carbon atoms” includecompounds in which the hydrogen atom is introduced into the “aryl group”described in the specific example group G1, and the like.

The “heterocyclic rings” for the ring A1 and the ring A2 each have thesame structure as the compound in which a hydrogen atom is introducedinto the “heterocyclic group” described above. The “heterocyclic ring”of the ring A1 and the ring A2 contains two carbon atoms on the centralfused bicyclic structure of the formula (21) as ring atoms. Specificexamples of the “substituted or unsubstituted heterocyclic ringincluding 5 to 50 ring atoms” include compounds in which the hydrogenatom is introduced into the “heterocyclic group” described in thespecific example group G2, and the like.

R_(b) is bonded with either carbon atom, which forms aromatichydrocarbon ring of the ring A1, or with either atom, which formsheterocyclic ring of the ring A1.

R_(c) is bonded with either carbon atom, which forms aromatichydrocarbon ring of the ring A2, or with either atom, which formsheterocyclic ring of the ring A2.

It is preferable that at least one (preferably two) of R_(a) to R_(c) bea group represented by the following formula (21a).-L₂₀₁-Ar₂₀₁  (21a)

In the formula (21a),

L₂₀₁ is

-   a single bond,-   a substituted or unsubstituted arylene group including 6 to 30 ring    carbon atoms, or-   a substituted or unsubstituted divalent heterocyclic group including    5 to 30 ring atoms.

Ar₂₀₁ is

-   a substituted or unsubstituted aryl group including 6 to 50 ring    carbon atoms,-   a substituted or unsubstituted monovalent heterocyclic group    including 5 to 50 ring atoms, or-   a group represented by the following formula (21b).

In the formula (21b),

L₂₁₁ and L₂₁₂ are independently

-   a single bond,-   a substituted or unsubstituted arylene group including 6 to 30 ring    carbon atoms, or-   a substituted or unsubstituted divalent heterocyclic group including    5 to 30 ring atoms.

Ar₂₁₁ and Ar₂₁₂ form a substituted or unsubstituted, saturated orunsaturated ring by bonding with each other, or do not form asubstituted or unsubstituted, saturated or unsaturated ring.

Ar₂₁₁ and Ar₂₁₂ which do not form a substituted or unsubstituted,saturated or unsaturated ring are independently

-   a substituted or unsubstituted aryl group including 6 to 50 ring    carbon atoms, or-   a substituted or unsubstituted monovalent heterocyclic group    including 5 to 50 ring atoms.

In one embodiment, the compound represented by the formula (21) is acompound represented by the following formula (22).

In the formula (22), one or more sets of adjacent two or more of R₂₀₁ toR₂₁₁ form a substituted or unsubstituted, saturated or unsaturated ringby bonding with each other, or do not form a substituted orunsubstituted, saturated or unsaturated ring.

R₂₀₁ to R₂₁₁ which do not form the substituted or unsubstituted,saturated or unsaturated ring are independently

-   a hydrogen atom,-   a substituted or unsubstituted alkyl group including 1 to 50 carbon    atoms,-   a substituted or unsubstituted alkenyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted alkynyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted cycloalkyl group including 3 to 50    ring carbon atoms,-   —Si(R₉₀₁)(R₉₀₂)(R₉₀₃),-   —O—(R₉₀₄),-   —S—(R₉₀₅),-   —N(R₉₀₆)(R₉₀₇),-   a halogen atom, a cyano group, a nitro group,-   a substituted or unsubstituted aryl group including 6 to 50 ring    carbon atoms, or-   a substituted or unsubstituted monovalent heterocyclic group    including 5 to 50 ring atoms.

R₉₀₁ to R₉₀₇ are as defined in the formula (1).

It is preferable that at least one (preferably two) of R₂₀₁ to R₂₁₁ be agroup represented by the formula (21a). Preferably, R₂₀₄ and R₂₁₁ aregroups represented by the formula (21a).

In one embodiment, the compound represented by the formula (21) is acompound in which a structure represented by the following formula(21-1) or (21-2) is bonded with the ring A1. In one embodiment, thecompound represented by the formula (22) is a compound in which astructure represented by the following formula (21-1) or (21-2) isbonded with the ring with which R₂₀₄ to R₂₀₇ are bonded.

In the formula (21-1), the two of “*” are respectively bonded with thering carbon atoms of the aromatic hydrocarbon ring or the ring atoms ofthe heterocyclic ring of the ring A1 in the formula (21), or with eitherR₂₀₄ to R₂₀₇ in the formula (22).

The three of “*” in the formula (21-2) are respectively bonded with thering carbon atoms of the aromatic hydrocarbon ring or the ring atoms ofthe heterocyclic ring of the ring A1 in the formula (22), or with eitherR₂₀₄ to R₂₀₇ in the formula (22).

One or more sets of adjacent two or more of R₂₂₁ to R₂₂₇ and R₂₃₁ toR₂₃₉ form a substituted or unsubstituted, saturated or unsaturated ringby bonding with each other, or do not form a substituted orunsubstituted, saturated or unsaturated ring.

R₂₂₁ to R₂₂₇ and R₂₃₁ to R₂₃₉ which do not form a substituted orunsubstituted, saturated or unsaturated ring are independently

-   a hydrogen atom,-   a substituted or unsubstituted alkyl group including 1 to 50 carbon    atoms,-   a substituted or unsubstituted alkenyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted alkynyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted cycloalkyl group including 3 to 50    ring carbon atoms,-   —Si(R₉₀₁)(R₉₀₂)(R₉₀₃),-   —O—(R₉₀₄),-   —S—(R₉₀₅),-   —N(R₉₀₆)(R₉₀₇),-   a halogen atom, a cyano group, a nitro group,-   a substituted or unsubstituted aryl group including 6 to 50 ring    carbon atoms, or-   a substituted or unsubstituted monovalent heterocyclic group    including 5 to 50 ring atoms.

R₉₀₁ to R₉₀₇ are as defined in the formula (1).

In one embodiment, the compound represented by the formula (21) is acompound represented by the following formula (21-3), formula (21-4), orformula (21-5).

In the formula (21-3), formula (21-4), and formula (21-5), the ring A1is as defined in the formula (21).

R₂₄₀₁ to R₂₄₀₇ are the same as R₂₂₁ to R₂₂₇ in the formula (21-1) and(21-2). R₂₄₁₀ to R₂₄₁₇ are the same as R₂₀₁ to R₂₁₁ in the formula (22).

In one embodiment, the substituted or unsubstituted aromatic hydrocarbonring including 6 to 50 ring carbon atoms of the ring A1 in the formula(21-5) is a substituted or unsubstituted naphthalene ring or asubstituted or unsubstituted fluorene ring.

In one embodiment, the substituted or unsubstituted heterocyclic ringincluding 5 to 50 ring atoms of the ring A1 in the formula (21-5) is asubstituted or unsubstituted dibenzofuran ring, a substituted orunsubstituted carbazole ring, or a substituted or unsubstituteddibenzothiophene ring.

In one embodiment, the compound represented by the formula (21) orformula (22) is selected from the group consisting of compoundsrepresented by each of the following formulas (21-6-1) to (21-6-7).

In the formulas (21-6) to (21-6-7),

R₂₄₂₁ to R₂₄₂₇ is the same as R₂₂₁ to R₂₂₇ in the formulas (21-1) and(21-2). R₂₄₃₀ to R₂₄₃₇ and R₂₄₄₁ to R₂₄₄₄ are the same as R₂₀₁ to R₂₁₁in the formula (22).

X is O, NR₉₀₁, or C(R₉₀₂)(R₉₀₃).

R₉₀₁ to R₉₀₃ are as defined in the formula (1).

In one embodiment, in the compound represented by the formula (22), oneor more sets of adjacent two or more of R₂₀₁ to R₂₁₁ form a substitutedor unsubstituted, saturated or unsaturated ring by bonding with eachother. This embodiment will be described in detail below as the formula(25).

(Compound Represented by the Formula (25))

A compound represented by the formula (25) will be described.

In the formula (25),

two or more of the sets selected from the group consisting of R₂₅₁ andR₂₅₂, R₂₅₂ and R₂₅₃, R₂₅₄ and R₂₅₅, R₂₅₅ and R₂₅₆, R₂₅₆ and R₂₅₇, R₂₅₈and R₂₅₉, R₂₅₉ and R₂₆₀, and R₂₆₀ and R₂₆₁ form a substituted orunsubstituted, saturated or unsaturated ring by bonding with each other;and provided that a set of R₂₅₁ and R₂₅₂ and a set of R₂₅₂ and R₂₅₃; aset of R₂₅₄ and R₂₅₅ and a set of R₂₅₅ and R₂₅₆; a set of R₂₅₅ and R₂₅₆and a set of R₂₅₆ and R₂₅₇; a set of R₂₅₈ and R₂₅₉ and a set of R₂₅₉ andR₂₆₀; and a set of R₂₅₉ and R₂₆₀ and a set of R₂₆₀ and R₂₆₁ do not formrings at the same time.

The two or more rings formed by R₂₅₁ to R₂₆₁ may be the same as ordifferent from each other.

R₂₅₁ to R₂₆₁ which do not form the substituted or unsubstituted,saturated or unsaturated ring are independently

-   a hydrogen atom,-   a substituted or unsubstituted alkyl group including 1 to 50 carbon    atoms,-   a substituted or unsubstituted alkenyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted alkynyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted cycloalkyl group including 3 to 50    ring carbon atoms,-   —Si(R₉₀₁)(R₉₀₂)(R₉₀₃),-   —O—(R₉₀₄),-   —S—(R₉₀₅),-   —N(R₉₀₆)(R₉₀₇),-   a halogen atom, a cyano group, a nitro group,-   a substituted or unsubstituted aryl group including 6 to 50 ring    carbon atoms, or-   a substituted or unsubstituted monovalent heterocyclic group    including 5 to 50 ring atoms.

R₉₀₁ to R₉₀₇ are as defined in the formula (1).

In the formula (25), R_(n) and R_(n+1) (n represents an integer selectedfrom 251, 252, 254 to 256, and 258 to 260) form a substituted orunsubstituted, saturated or unsaturated ring, together with the two ringcarbon atoms with which R_(n) and R_(n+1) are bonded, by bonding witheach other. The ring is preferably composed of atoms selected from Catom, O atom, S atom, and N atom, and the number of atoms is preferably3 to 7, and more preferably 5 or 6.

The number of ring structures described above in the compoundrepresented by the formula (25) is, for example, 2, 3, or 4. The two ormore ring structures may be present on the same benzene ring of themother skeleton in the formula (25), respectively, or may be present onthe different benzene rings. For example, when the compound has threering structures, a ring structure may be present in each of the threebenzene rings in the formula (25) one by one.

Examples of the above-mentioned ring structure in the compoundrepresented by the formula (25) include structures represented by eachof the following formulas (251) to (260), and the like.

In the formula (251) to (257), each of *1 and *2, *3 and *4, *5 and *6,*7 and *8, *9 and *10, *11 and *12, and *13 and *14 represents the tworing carbon atoms with which R_(n) and R_(n+1) are bound, and ringcarbon atoms with which R_(n) is bonded may be any of the two ringcarbon atoms represented by *1 and *2, *3 and *4, *5 and *6, *7 and *8,*9 and *10, *11 and *12, and *13 and *14.

X₂₅₀₁ is C(R₂₅₁₂) (R₂₅₁₃), NR₂₅₁₄, O, or S.

One or more sets of adjacent two or more of R₂₅₀₁ to R₂₅₀₆ and R₂₅₁₂ toR₂₅₁₃ form a substituted or unsubstituted, saturated or unsaturated ringby bonding with each other, or do not form a substituted orunsubstituted, saturated or unsaturated ring.

R₂₅₀₁ to R₂₅₁₄ which do not form the substituted or unsubstituted,saturated or unsaturated ring are the same as R₂₅₁ to R₂₆₁.

In the formulas (258) to (260), *1 and *2, and *3 and *4 each representthe two ring carbon atoms with which R_(n) and R_(n+1) are bonded, andring carbon atoms with which R_(n) is bonded may be either two ringcarbon atoms represented by *1 and *2, or *3 and *4.

X₂₅₀₁ is C(R₂₅₁₂) (R₂₅₁₃), NR₂₅₁₄, O, or S.

One or more sets of adjacent two or more of R₂₅₁₅ to R₂₅₂₅ form asubstituted or unsubstituted, saturated or unsaturated ring by bondingwith each other, or do not form a substituted or unsubstituted,saturated or unsaturated ring.

R₂₅₁₅ to R₂₅₂₁ and R₂₅₂₂ to R₂₅₂₅ which do not form a substituted orunsubstituted, saturated or unsaturated ring are the same as R₂₅₁ toR₂₆₁.

In the formula (25), at least one of R₂₅₂, R₂₅₄, R₂₅₅, R₂₆₀, and R₂₆₁(preferably at least one of R₂₅₂, R₂₅₅, and R₂₆₀, and more preferablyR₂₅₂) is preferably a group which does not form a ring structure.

Preferably,

-   (i) the substituent when the ring formed by R_(n) and R_(n+1) in the    formula (25) has a substituent,-   (ii) R₂₅₁ to R₂₆₁ which do not form a ring structure in the formula    (25), and-   (iii) R₂₅₀₁ to R₂₅₁₄ and R₂₅₁₅ to R₂₅₂₅ in the formulas (251)    to (260) are independently-   a hydrogen atom,-   a substituted or unsubstituted alkyl group including 1 to 50 carbon    atoms,-   a substituted or unsubstituted alkenyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted alkynyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted cycloalkyl group including 3 to 50    ring carbon atoms,-   —N(R₉₀₆)(R₉₀₇),-   a substituted or unsubstituted aryl group including 6 to 50 ring    carbon atoms,-   a substituted or unsubstituted monovalent heterocyclic group    including 5 to 50 ring atoms, or-   any of the groups selected from the following groups.

In the formulas (261) to (264), Rd'S are independently

-   a hydrogen atom,-   a substituted or unsubstituted alkyl group including 1 to 50 carbon    atoms,-   a substituted or unsubstituted alkenyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted alkynyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted cycloalkyl group including 3 to 50    ring carbon atoms,-   —Si(R₉₀₁)(R₉₀₂)(R₉₀₃),-   —O—(R₉₀₄),-   —S—(R₉₀₅),-   —N(R₉₀₆)(R₉₀₇),-   a halogen atom, a cyano group, a nitro group,-   a substituted or unsubstituted aryl group including 6 to 50 ring    carbon atoms, or-   a substituted or unsubstituted monovalent heterocyclic group    including 5 to 50 ring atoms.

X is C(R₉₀₁)(R₉₀₂), NR₉₀₃, O, or S.

R₉₀₁ to R₉₀₇ are as defined in the formula (1).

p1's are independently an integer of 0 to 5, p2's are independently aninteger of 0 to 4, p3 is an integer of 0 to 3, and p4 is an integer of 0to 7.

In one embodiment, the compound represented by the formula (25) is acompound represented by any of the following formulas (25-1) to (25-6).

In the formulas (25-1) to (25-6), rings d to i are independently asubstituted or unsubstituted, saturated or unsaturated ring; and R₂₅₁ toR₂₆₁ are the same as in the formula (25).

In one embodiment, the compound represented by the formula (25) is acompound represented by any of the following formulas (25-7) to (25-12).

In the formulas (25-7) to (25-12), rings d to f, k, and j areindependently a substituted or unsubstituted, saturated or unsaturatedring; and R₂₅₁ to R₂₆₁ are the same as in the formula (25).

In one embodiment, the compound represented by the formula (25) is acompound represented by any of the following formulas (25-13) to(25-21).

In the formulas (25-13) to (25-21), rings d to k are independently asubstituted or unsubstituted, saturated or unsaturated ring; and R₂₅₁ toR₂₆₁ are the same as in the formula (25).

Examples of the substituent when the ring g or h further has asubstituent include, for example, a substituted or unsubstituted alkylgroup including 1 to 50 carbon atoms, a substituted or unsubstitutedaryl group including 6 to 50 ring carbon atoms, or the group representedby the formula (261), (263), or (264).

In one embodiment, the compound represented by the formula (25) is acompound represented by any of the following formulas (25-22) to(25-25).

In the formulas (25-22) to (25-25), X₂₅₀'s are independentlyC(R₉₀₁)(R₉₀₂), NR₉₀₃, O, or S. R₂₅₁ to R₂₆₁, and R₂₇₁ to R₂₇₈ are thesame as R₂₅₁ to R₂₆₁ in the formula (25). R₉₀₁ to R₉₀₃ are as defined inthe formula (1).

In one embodiment, the compound represented by the formula (25) is acompound represented by the following formula (25-26).

In the formula (25-26), X₂₅₀ is C(R₉₀₁) (R₉₀₂), NR₉₀₃, O, or S. R₂₅₃,R₂₅₄, R₂₅₇, R₂₅₈, R₂₆₁, and R₂₇₁ to R₂₈₂ are the same as R₂₅₁ to R₂₆₁ inthe formula (25). R₉₀₁ to R₉₀₃ are as defined in the formula (1).

Examples of the compound represented by the formula (21) include, forexample, compounds shown below as specific examples. In the followingspecific examples, “Me” represents a methyl group.

(Compound Represented by the Formula (31))

A compound represented by the formula (31) will be described. Thecompound represented by the formula (31) is a compound corresponding tothe compound represented by the formula (21-3) described above.

In the formula (31),

one or more sets of adjacent two or more of R₃₀₁ to R₃₀₇ and R₃₁₁ toR₃₁₇ form a substituted or unsubstituted, saturated or unsaturated ring,or do not form a substituted or unsubstituted, saturated or unsaturatedring;

R₃₀₁ to R₃₀₇ and R₃₁₁ to R₃₁₇ which do not form the substituted orunsubstituted, saturated or unsaturated ring are independently

-   a hydrogen atom,-   a substituted or unsubstituted alkyl group including 1 to 50 carbon    atoms,-   a substituted or unsubstituted alkenyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted alkynyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted cycloalkyl group including 3 to 50    ring carbon atoms,-   —Si(R₉₀₁)(R₉₀₂)(R₉₀₃),-   —O—(R₉₀₄),-   —S—(R₉₀₅),-   —N(R₉₀₆)(R₉₀₇),-   a halogen atom, a cyano group, a nitro group,-   a substituted or unsubstituted aryl group including 6 to 50 ring    carbon atoms, or-   a substituted or unsubstituted monovalent heterocyclic group    including 5 to 50 ring atoms.

R₃₂₁ and R₃₂₂ are independently

-   a hydrogen atom,-   a substituted or unsubstituted alkyl group including 1 to 50 carbon    atoms,-   a substituted or unsubstituted alkenyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted alkynyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted cycloalkyl group including 3 to 50    ring carbon atoms,-   —Si(R₉₀₁)(R₉₀₂)(R₉₀₃),-   —O—(R₉₀₄),-   —S—(R₉₀₅),-   —N(R₉₀₆)(R₉₀₇),-   a halogen atom, a cyano group, a nitro group,-   a substituted or unsubstituted aryl group including 6 to 50 ring    carbon atoms, or-   a substituted or unsubstituted monovalent heterocyclic group    including 5 to 50 ring atoms.

R₉₀₁ to R₉₀₇ are as defined in the formula (1).

The “set of adjacent two or more of R₃₀₁ to R₃₀₇ and R₃₁₁ to R₃₁₇”includes, for example, sets of R₃₀₁ and R₃₀₂, R₃₀₂ and R₃₀₃, R₃₀₃ andR₃₀₄, R₃₀₅ and R₃₀₆, and R₃₀₆ and R₃₀₇, and a set of R₃₀₁, R₃₀₂ andR₃₀₃, and the like.

In one embodiment, at least one, with preferably two, of R₃₀₁ to R₃₀₇and R₃₁₁ to R₃₁₇ are a group represented by —N(R₉₀₆)(R₉₀₇).

In one embodiment, R₃₀₁ to R₃₀₇ and R₃₁₁ to R₃₁₇ are independently ahydrogen atom, a substituted or unsubstituted aryl group including 6 to50 ring carbon atoms, or a substituted or unsubstituted monovalentheterocyclic group including 5 to 50 ring atoms.

In one embodiment, the compound represented by the formula (31) is acompound represented by the following formula (32).

In the formula (32),

one or more sets of adjacent two or more of R₃₃₁ to R₃₃₄ and R₃₄₁ toR₃₄₄ form a substituted or unsubstituted, saturated or unsaturated ring,or do not form a substituted or unsubstituted, saturated or unsaturatedring;

R₃₃₁ to R₃₃₄ and R₃₄₁ to R₃₄₄ which do not form the substituted orunsubstituted, saturated or unsaturated ring, and R₃₅₁ and R₃₅₂ areindependently

-   a hydrogen atom,-   a substituted or unsubstituted aryl group including 6 to 50 ring    carbon atoms, or-   a substituted or unsubstituted monovalent heterocyclic group    including 5 to 50 ring atoms.

R₃₆₁ to R₃₆₄ are independently

-   a substituted or unsubstituted aryl group including 6 to 50 ring    carbon atoms, or-   a substituted or unsubstituted monovalent heterocyclic group    including 5 to 50 ring atoms.

In one embodiment, the compound represented by the formula (31) is acompound represented by the following formula (33).

In the formula (33), R₃₅₁, R₃₅₂, and R₃₆₁ to R₃₆₄ are as defined in theformula (32).

In one embodiment, R₃₆₁ to R₃₆₄ in the formulas (32) and (33) areindependently a substituted or unsubstituted aryl group including 6 to50 ring carbon atoms (preferably a phenyl group).

In one embodiment, R₃₂₁ and R₃₂₂ in the formula (31) and R₃₅₁ and R₃₅₂in the formulas (32) and (33) are hydrogen atoms.

In one embodiment, the substituent in the case of “substituted orunsubstituted” in the formulas (31) to (33) is

-   a substituted or unsubstituted alkyl group including 1 to 50 carbon    atoms,-   a substituted or unsubstituted alkenyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted alkynyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted cycloalkyl group including 3 to 50    ring carbon atoms,-   a substituted or unsubstituted aryl group including 6 to 50 ring    carbon atoms, or-   a substituted or unsubstituted monovalent heterocyclic group    including 5 to 50 ring atoms.

Specific examples of the compound represented by the formula (31)include the following compounds.

In the following specific examples, “Me” represents a methyl group.

(Compound Represented by the Formula (41))

A compound represented by the formula (41) will be described.

In the formula (41),

ring a, ring b and ring c are independently

-   a substituted or unsubstituted aromatic hydrocarbon ring including 6    to 50 ring carbon atoms, or-   a substituted or unsubstituted heterocyclic ring including 5 to 50    ring atoms.

R₄₀₁ and R₄₀₂ independently form a substituted or unsubstitutedheterocyclic ring by bonding with the ring a, the ring b, or the ring c,or do not form a substituted or unsubstituted heterocyclic ring.

R₄₀₁ and R₄₀₂ which do not form the substituted or unsubstitutedheterocyclic ring are independently

-   a substituted or unsubstituted alkyl group including 1 to 50 carbon    atoms,-   a substituted or unsubstituted alkenyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted alkynyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted cycloalkyl group including 3 to 50    ring carbon atoms,-   a substituted or unsubstituted aryl group including 6 to 50 ring    carbon atoms, or-   a substituted or unsubstituted monovalent heterocyclic group    including 5 to 50 ring atoms.

The ring a, the ring b, and the ring c are a ring (a substituted orunsubstituted aromatic hydrocarbon ring including 6 to 50 ring carbonatoms, or a substituted or unsubstituted heterocyclic ring including 5to 50 ring atoms) fused to the central fused bicyclic structure composedof a B atom and two N atoms in the formula (41).

The “aromatic hydrocarbon ring” for the ring a, the ring b, and the ringc has the structure same as the compound in which a hydrogen atom isintroduced into the “aryl group” described above. The “aromatichydrocarbon ring” for the ring a contains three carbon atoms on thecentral fused bicyclic structure in the formula (41) as ring atoms. The“aromatic hydrocarbon ring” for the ring band the ring c contains twocarbon atoms on the central fused bicyclic structure in the formula (41)as ring atoms. Specific examples of the “substituted or unsubstitutedaromatic hydrocarbon ring including 6 to 50 ring carbon atoms” includecompounds in which the hydrogen atom is introduced into the “aryl group”described in the specific example group G1, and the like.

The “heterocyclic ring” for the ring a, the ring b, and the ring c hasthe structure same as the compound in which a hydrogen atom isintroduced into the “heterocyclic group” described above. The“heterocyclic ring” for the ring a contains three carbon atoms on thecentral fused bicyclic structure in the formula (41) as ring atoms. The“heterocyclic ring” for the ring band the ring c contains two carbonatoms on the central fused bicyclic structure in the formula (41) as thering atoms. Specific examples of the “substituted or unsubstitutedheterocyclic ring including 5 to 50 ring atoms” include compounds inwhich the hydrogen atom is introduced into the “heterocyclic group”described in the specific example group G2, and the like.

R₄₀₁ and R₄₀₂ may independently form a substituted or unsubstitutedheterocyclic ring by bonding with the ring a, the ring b, or the ring c.The heterocyclic ring in this case contains the nitrogen atom on thecentral fused bicyclic structure in the formula (41). The heterocyclicring in this case may contain a hetero atom other than the nitrogenatom. The expression “R₄₀₁ and R₄₀₂ being bonded with the ring a, thering b, or the ring c” specifically means that the atoms forming thering a, the ring b, or the ring c are bonded with the atoms forming R₄₀₁and R₄₀₂. For example, R₄₀₁ may be bonded with the ring a to forma fusedbicyclic (or a fused tricyclic or more polycyclic) nitrogen-containingheterocyclic ring in which the ring containing R₄₀₁ is fused with thering a. Specific examples of the nitrogen-containing heterocyclic ringinclude a compound corresponding to a fused heterocyclic group composedof two or more rings which contains nitrogen in the specific examplegroup G2.

The same applies when R₄₀₁ is bonded with the ring b, when R₄₀₂ isbonded with the ring a, and when R₄₀₂ is bonded with the ring c.

In one embodiment, the ring a, the ring b, and the ring c in the formula(41) are independently a substituted or unsubstituted aromatichydrocarbon ring including 6 to 50 ring carbon atoms.

In one embodiment, the ring a, the ring b, and the ring c in the formula(41) are independently a substituted or unsubstituted benzene ring or asubstituted or unsubstituted naphthalene ring.

In one embodiment, R₄₀₁ and R₄₀₂ in the formula (41) are independently asubstituted or unsubstituted aryl group including 6 to 50 ring carbonatoms, or a substituted or unsubstituted monovalent heterocyclic groupincluding 5 to 50 ring atoms, and preferably a substituted orunsubstituted aryl group including 6 to 50 ring carbon atoms.

In one embodiment, the compound represented by the formula (41) is acompound represented by the following formula (42).

In the formula (42),

R_(401A) forms a substituted or unsubstituted heterocyclic ring bybonding with one or more selected from the group consisting of R₄₁₁ andR₄₂₁, or does not forma substituted or unsubstituted heterocyclic ring.R_(402A) forms a substituted or unsubstituted heterocyclic ring bybonding with one or more selected from the group consisting of R₄₁₃ andR₄₁₄, or does not form a substituted or unsubstituted heterocyclic ring.

R_(401A) and R_(402A) which do not form the substituted or unsubstitutedheterocyclic ring are independently

-   a substituted or unsubstituted alkyl group including 1 to 50 carbon    atoms,-   a substituted or unsubstituted alkenyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted alkynyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted cycloalkyl group including 3 to 50    ring carbon atoms,-   a substituted or unsubstituted aryl group including 6 to 50 ring    carbon atoms, or-   a substituted or unsubstituted monovalent heterocyclic group    including 5 to 50 ring atoms.

One or more sets of adjacent two or more of R₄₁₁ to R₄₂₁ form asubstituted or unsubstituted, saturated

-   or unsaturated ring by bonding with each other, or do not form a    substituted or unsubstituted, saturated or unsaturated ring.

R₄₁₁ to R₄₂₁ which do not form the substituted or unsubstitutedheterocyclic ring or the substituted or unsubstituted, saturated orunsaturated ring are independently

-   a hydrogen atom,-   a substituted or unsubstituted alkyl group including 1 to 50 carbon    atoms,-   a substituted or unsubstituted alkenyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted alkynyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted cycloalkyl group including 3 to 50    ring carbon atoms,-   —Si(R₉₀₁)(R₉₀₂)(R₉₀₃),-   —O—(R₉₀₄),-   —S—(R₉₀₅),-   —N(R₉₀₆)(R₉₀₇),-   a halogen atom, a cyano group, a nitro group,-   a substituted or unsubstituted aryl group including 6 to 50 ring    carbon atoms, or-   a substituted or unsubstituted monovalent heterocyclic group    including 5 to 50 ring atoms.

R₉₀₁ to R₉₀₇ are as defined in the formula (1).

R_(401A) and R_(402A) in the formula (42) are groups corresponding toR₄₀₁ and R₄₂ in the formula (41).

For example, R_(401A) and R₄₁₁ may be bonded with each other to form afused bicyclic (or fused tricyclic or more polycyclic)nitrogen-containing heterocyclic ring in which a benzene ringcorresponding to the ring a is fused with a ring containing them.Specific examples of the nitrogen-containing heterocyclic ring include acompound corresponding to a fused bicyclic or morepolycyclicheterocyclic group which contains nitrogen in the specificexample group G2. The same applies when R_(401A) and R₄₁₂ are bondedwith each other, when R_(402A) and R₄₁₃ are bonded with each other, andwhen R_(402A) and R₄₁₄ are bonded with each other.

One or more sets of adjacent two or more of R₄₁₁ to R₄₂₁ may form asubstituted or unsubstituted, saturated or unsaturated ring by bondingwith each other. For example, R₄₁₁ and R₄₁₂ may forma structure in whicha benzene ring, an indole ring, a pyrrole ring, a benzofuran ring, abenzothiophene ring, and the like are fused to a 6-membered ring withwhich they are bonded, and the formed fused ring is a naphthalene ring,a carbazole ring, an indole ring, a dibenzofuran ring, or adibenzothiophene ring.

In one embodiment, R₄₁₁ to R₄₂₁ which do not contribute to ringformation are independently a hydrogen atom, a substituted orunsubstituted alkyl group including 1 to 50 carbon atoms, a substitutedor unsubstituted aryl group including 6 to 50 ring carbon atoms, or asubstituted or unsubstituted monovalent heterocyclic group including 5to 50 ring atoms.

In one embodiment, R₄₁₁ to R₄₂₁ which do not contribute to ringformation are independently a hydrogen atom, a substituted orunsubstituted aryl group including 6 to 50 ring carbon atoms, or asubstituted or unsubstituted monovalent heterocyclic group including 5to 50 ring atoms.

In one embodiment, R₄₁₁ to R₄₂₁ which do not contribute to ringformation are independently a hydrogen atom, or a substituted orunsubstituted alkyl group including 1 to 50 carbon atoms.

In one embodiment, R₄₁₁ to R₄₂₁ which do not contribute to ringformation are independently a hydrogen atom, or a substituted orunsubstituted alkyl group including 1 to 50 carbon atoms, and at leastone of R₄₁₁ to R₄₂₁ is a substituted or unsubstituted alkyl groupincluding 1 to 50 carbon atoms.

In one embodiment, the compound represented by the formula (42) is acompound represented by the following formula (43).

In the formula (43),

R₄₃₁ forms a substituted or unsubstituted heterocyclic ring by bondingwith R₄₄₆, or does not form a substituted or unsubstituted heterocyclicring. R₄₃ forms a substituted or unsubstituted heterocyclic ring bybonding with R₄₄₇, or does not forma substituted or unsubstitutedheterocyclic ring. R₄₃₄ forms a substituted or unsubstitutedheterocyclic ring by bonding with R₄₅₁, or does not form a substitutedor unsubstituted heterocyclic ring. R₄₄₁ forms a substituted orunsubstituted heterocyclic ring by bonding with R₄₄₂, or does not form asubstituted or unsubstituted heterocyclic ring.

One or more sets of adjacent two or more of R₄₁ to R₄₅₁ form asubstituted or unsubstituted, saturated or unsaturated ring by bondingwith each other, or do not form a substituted or unsubstituted,saturated or unsaturated ring.

R₄₃₁ to R₄₅₁ which do not form the substituted or unsubstitutedheterocyclic ring or the substituted or unsubstituted, saturated orunsaturated ring are independently

-   a hydrogen atom,-   a substituted or unsubstituted alkyl group including 1 to 50 carbon    atoms,-   a substituted or unsubstituted alkenyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted alkynyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted cycloalkyl group including 3 to 50    ring carbon atoms,-   —Si(R₉₀₁)(R₉₀₂)(R₉₀₃),-   —O—(R₉₀₄),-   —S—(R₉₀₅),-   —N(R₉₀₆)(R₉₀₇),-   a halogen atom, a cyano group, a nitro group,-   a substituted or unsubstituted aryl group including 6 to 50 ring    carbon atoms, or-   a substituted or unsubstituted monovalent heterocyclic group    including 5 to 50 ring atoms.

R₉₀₁ to R₉₀₇ are as defined in the formula (1).

R₄₁ may form a substituted or unsubstituted heterocyclic ring by bondingwith R₄₄₆. For example,

R₄₃₁ and R₄₄₆ may be bonded with each other to form a fused tricyclic ormore polycyclic nitrogen-containing heterocyclic ring in which thebenzene ring with which R₄₆ is bonded, the ring containing N, and thebenzene ring corresponding to the ring a are fused to each other.Specific examples of the nitrogen-containing heterocyclic ring include acompound corresponding to a fused tricyclic or more polycyclicheterocyclic group which contains nitrogen in the specific example groupG2. The same applies when R₄₃₃ and R₄₃₇ are bonded with each other, whenR₄₃₄ and R₄₅₁ are bonded with each other, and when R₄₄₁ and R₄₄₂ arebonded with each other.

In one embodiment, R₄₃₁ to R₄₅₁ which do not contribute to ringformation are independently a hydrogen atom, a substituted orunsubstituted alkyl group including 1 to 50 carbon atoms, a substitutedor unsubstituted aryl group including 6 to 50 ring carbon atoms, or asubstituted or unsubstituted monovalent heterocyclic group including 5to 50 ring atoms.

In one embodiment, R₄₃₁ to R₄₅₁ which do not contribute to ringformation are independently a hydrogen atom, a substituted orunsubstituted aryl group including 6 to 50 ring carbon atoms, or asubstituted or unsubstituted monovalent heterocyclic group including 5to 50 ring atoms.

In one embodiment, R₄₃₁ to R₄₅₁ which do not contribute to ringformation are independently a hydrogen atom, or a substituted orunsubstituted alkyl group including 1 to 50 carbon atoms.

In one embodiment, R₄₃₁ to R₄₅₁ which do not contribute to ringformation are independently a hydrogen atom, or a substituted orunsubstituted alkyl group including 1 to 50 carbon atoms, and at leastone of R₄₃₁ to R₄₅₁ is a substituted or unsubstituted alkyl groupincluding 1 to 50 carbon atoms.

In one embodiment, the compound represented by the formula (43) is acompound represented by the following formula (43A).

In the formula (43A),

R₄₆₁ is

-   a hydrogen atom,-   a substituted or unsubstituted alkyl group including 1 to 50 carbon    atoms,-   a substituted or unsubstituted alkenyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted alkynyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted cycloalkyl group including 3 to 50    ring carbon atoms, or-   a substituted or unsubstituted aryl group including 6 to 50 ring    carbon atoms.

R₄₆₂ to R₄₅ are independently

-   a substituted or unsubstituted alkyl group including 1 to 50 carbon    atoms,-   a substituted or unsubstituted alkenyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted alkynyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted cycloalkyl group including 3 to 50    ring carbon atoms, or-   a substituted or unsubstituted aryl group including 6 to 50 ring    carbon atoms.

In one embodiment, R₄₆₁ to R₄₆₅ are independently a substituted orunsubstituted alkyl group including 1 to 50 carbon atoms, or asubstituted or unsubstituted aryl group including 6 to 50 ring carbonatoms.

In one embodiment, R₄₆₁ to R₄₆₅ are independently a substituted orunsubstituted alkyl group including 1 to 50 carbon atoms.

In one embodiment, the compound represented by the formula (43) is acompound represented by the following formula (43B).

In the formula (43B),

R₄₇₁ and R₄₇₂ are independently

-   a hydrogen atom,-   a substituted or unsubstituted alkyl group including 1 to 50 carbon    atoms,-   a substituted or unsubstituted alkenyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted alkynyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted cycloalkyl group including 3 to 50    ring carbon atoms,-   —N(R₉₀₆)(R₉₀₇), or-   a substituted or unsubstituted aryl group including 6 to 50 ring    carbon atoms.

R₄₇₃ to R₄₇₅ are independently

-   a substituted or unsubstituted alkyl group including 1 to 50 carbon    atoms,-   a substituted or unsubstituted alkenyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted alkynyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted cycloalkyl group including 3 to 50    ring carbon atoms,-   —N(R₉₀₆)(R₉₀₇), or-   a substituted or unsubstituted aryl group including 6 to 50 ring    carbon atoms.

R₉₀₆ and R₉₀₇ are as defined in the formula (1).

In one embodiment, the compound represented by the formula (43) is acompound represented by the following formula (43B′).

In the formula (43B′), R₄₇₂ to R₄₇₅ are as defined in the formula (43B).

In one embodiment, at least one of R₄₇₁ to R₄₇₅ is

-   a substituted or unsubstituted alkyl group including 1 to 50 carbon    atoms,-   a substituted or unsubstituted alkenyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted alkynyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted cycloalkyl group including 3 to 50    ring carbon atoms,-   —N(R₉₀₆)(R₉₀₇), or-   a substituted or unsubstituted aryl group including 6 to 50 ring    carbon atoms.

In one embodiment,

R₄₇₂ is

-   a hydrogen atom,-   a substituted or unsubstituted alkyl group including 1 to 50 carbon    atoms,-   —N(R₉₀₆)(R₉₀₇), or-   a substituted or unsubstituted aryl group including 6 to 50 ring    carbon atoms.

R₄₇₁ and R₄₇₃ to R₄₇₅ are independently

-   a substituted or unsubstituted alkyl group including 1 to 50 carbon    atoms,-   —N(R₉₀₆)(R₉₀₇), or-   a substituted or unsubstituted aryl group including 6 to 50 ring    carbon atoms.

In one embodiment, the compound represented by the formula (43) is acompound represented by the following formula (43C).

In the formula (43C),

R₄₈₁ and R₄₈₂ are independently

-   a hydrogen atom,-   a substituted or unsubstituted alkyl group including 1 to 50 carbon    atoms,-   a substituted or unsubstituted alkenyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted alkynyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted cycloalkyl group including 3 to 50    ring carbon atoms, or-   a substituted or unsubstituted aryl group including 6 to 50 ring    carbon atoms.

R₄₈₃ to R₄₈₆ are independently

-   a substituted or unsubstituted alkyl group including 1 to 50 carbon    atoms,-   a substituted or unsubstituted alkenyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted alkynyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted cycloalkyl group including 3 to 50    ring carbon atoms, or-   a substituted or unsubstituted aryl group including 6 to 50 ring    carbon atoms.

In one embodiment, the compound represented by the formula (43) is acompound represented by the following formula (43C′).

In the formula (43C), R₄₈₃ to R₄₈₆ are as defined in the formula (43C).

In one embodiment, R₄₈₁ to R₄₈₆ are independently a substituted orunsubstituted alkyl group including 1 to 50 carbon atoms, or asubstituted or unsubstituted aryl group including 6 to 50 ring carbonatoms.

In one embodiment, R₄₈₁ to R₄₈₆ are independently a substituted orunsubstituted aryl group including 6 to 50 ring carbon atoms.

In the compound represented by the formula (41), for example, anintermediate is prepared by first bonding the ring a, the ring b, andthe ring c via linking groups (a group containing N—R₁ and a groupcontaining N—R₂) (first reaction), and a final product can be preparedby bonding the ring a, the ring b, and the ring c via a linking group (agroup containing B) (second reaction). In the first reaction, anamination reaction such as a Buchwald-Hartwig reaction or the like canbe applied. In the second reaction, a tandem hetero-Friedel-Craftsreaction or the like can be applied.

Hereinafter, specific examples of the compound represented by theformula (41) will be described, but are illustrative only, and thecompound represented by the formula (41) is not limited to the followingspecific examples. In the following specific examples, “Me” represents amethyl group, and “tBu” represents a tert-butyl group.

(Compound Represented by the Formula (51))

A compound represented by formula (51) will be described.

In the formula (51),

a ring r is a ring represented by the formula (52) or formula (53) whichis fused with an adjacent ring at an arbitrary position.

A ring q and a ring s are independently a ring represented by theformula (54) which is fused with an adjacent ring at an arbitraryposition.

A ring p and a ring t are independently a structure represented by theformula (55) or the formula (56) which is fused with an adjacent ring atan arbitrary position.

When a plurality of R₉₀₁'s are present, the plurality of adjacent R₉₀₁'sform a substituted or unsubstituted, saturated or unsaturated ring bybonding with each other, or do not form a substituted or unsubstitutedsaturated or unsaturated ring.

X₅₀₁ is an oxygen atom, a sulfur atom, or NR₅₀₂.

R₅₀₁ and R₅₀₂ which do not form the substituted or unsubstituted,saturated or unsaturated ring are independently

-   a hydrogen atom,-   a substituted or unsubstituted alkyl group including 1 to 50 carbon    atoms,-   a substituted or unsubstituted alkenyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted alkynyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted cycloalkyl group including 3 to 50    ring carbon atoms,-   —Si(R₉₀₁)(R₉₀₂)(R₉₀₃),-   —O—(R₉₀₄),-   —S—(R₉₀₅),-   —N(R₉₀₆)(R₉₀₇),-   a halogen atom, a cyano group, a nitro group,-   a substituted or unsubstituted aryl group including 6 to 50 ring    carbon atoms, or-   a substituted or unsubstituted monovalent heterocyclic group    including 5 to 50 ring atoms.

R₉₀₁ to R₉₀₇ are as defined in the formula (1).

Ar₅₀₁ and Ar₅₀₂ are independently

-   a substituted or unsubstituted alkyl group including 1 to 50 carbon    atoms,-   a substituted or unsubstituted alkenyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted alkynyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted cycloalkyl group including 3 to 50    ring carbon atoms,-   a substituted or unsubstituted aryl group including 6 to 50 ring    carbon atoms, or-   a substituted or unsubstituted monovalent heterocyclic group    including 5 to 50 ring atoms.

L₅₀₁ is

-   a substituted or unsubstituted alkylene group including 1 to 50    carbon atoms,-   a substituted or unsubstituted alkenylene group including 2 to 50    carbon atoms,-   a substituted or unsubstituted alkynylene group including 2 to 50    carbon atoms,-   a substituted or unsubstituted cycloalkylene group including 3 to 50    ring carbon atoms,-   a substituted or unsubstituted arylene group including 6 to 50 ring    carbon atoms, or-   a substituted or unsubstituted divalent heterocyclic group including    5 to 50 ring atoms.

m1's are independently an integer of 0 to 2, m2's are independently aninteger of 0 to 4, m3's are independently an integer of 0 to 3, and m4'sare independently an integer of 0 to 5. When a plurality of R₅₀₁'s arepresent, the plurality of R₅₀₁'s may be the same as or different fromeach other.

In the formula (51), each ring of the ring p to the ring t is fused withthe adjacent ring by sharing two carbon atoms. The fused position andthe fused direction are not limited, and the fusion can be performed inarbitrary position and direction.

In one embodiment, in the formula (52) or formula (53) of the ring r,R₅₀₁ is a hydrogen atom.

In one embodiment, the compound represented by the formula (51) isrepresented by any of the following formulas (51-1) to (51-6).

In the formulas (51-1) to (51-6), R₅₀₁, X₅₀₁, Ar₅₀₁, Ar₅₀₂, L₅₀₁, and m3are as defined in the formula (51).

In one embodiment, the compound represented by the formula (51) is acompound represented by any of the following formulas (51-11) to(51-13).

In the formulas (51-11) to (51-13), R₅₀₁, X₅₀₁, Ar₅₀₁, Ar₅₀₂, L₅₀₁, m1,m3, and m4 are as defined in the formula (51).

In one embodiment, the compound represented by the formula (51) is acompound represented by any of the following formulas (51-21) to(51-25).

In the formulas (51-21) to (51-25), R₅₀₁, X₅₀₁, Ar₅₀₁, Ar₅₀₂, L₅₀₁, m1,and m4 are as defined in the formula (51).

In one embodiment, the compound represented by the formula (51) is acompound represented by any of the following formulas (51-31) to(51-33).

In the formulas (51-31) to (51-33), R₅₀₁, X₅₀₁, Ar₅₀₁, Ar₅₀₂, L₅₀₁, andm2 to m4 are as defined in the formula (51).

In one embodiment, Ar₅₀₁ and Ar₅₀₂ are independently a substituted orunsubstituted aryl group including 6 to 50 ring carbon atoms.

In one embodiment, one of Ar₅₀₁ and Ar₅₀₂ is a substituted orunsubstituted aryl group including 6 to 50 ring carbon atoms and theother is a substituted or unsubstituted monovalent heterocyclic groupincluding 5 to 50 ring atoms.

Specific examples of the compound represented by the formula (51)include the following compounds. In the following specific examples,“Me” represents a methyl group.

(Compound Represented by the Formula (61))

A compound represented by the formula (61) will be described.

In the formula (61),

at least one set of R₆₀₁ and R₆₀₂, R₆₀₂ and R₆₀₃, and R₆₀₃ and R₆₀₄forms a divalent group represented by the following formula (62) bybonding with each other.

At least one set of R₆₀₅ and R₆₀₆, R₆₀₆ and R₆₀₇, and R₆₀₇ and R₆₀₈forms a divalent group represented by the following formula (63) bybonding with each other.

At least one of R₆₀₁ to R₆₀₄ which do not form a divalent grouprepresented by the formula (62), and R₆₁₁ to R₆₁₄ is a monovalent grouprepresented by the following formula (64).

At least one of R₆₀₅ to R₆₀₈ which do not form a divalent grouprepresented by the formula (63), and R₆₂₁ to R₆₂₄ is a monovalent grouprepresented by the following formula (64).

X₆₀₁ is an oxygen atom, a sulfur atom, or NR₆₀₉.

R₆₀₁ to R₆₀₈ which do not form a divalent group represented by any ofthe formulas (62) and (63) and which are not a monovalent grouprepresented by the formula (64), R₆₁₁ to R₆₁₄ and R₆₂₁ to R₆₂₄ which arenot a monovalent group represented by the formula (64), and R₆₀₉ areindependently

-   a hydrogen atom,-   a substituted or unsubstituted alkyl group including 1 to 50 carbon    atoms,-   a substituted or unsubstituted alkenyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted alkynyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted cycloalkyl group including 3 to 50    ring carbon atoms,-   —Si(R₉₀₁)(R₉₀₂)(R₉₀₃),-   —O—(R₉₀₄),-   —S—(R₉₀₅),-   —N(R₉₀₆)(R₉₀₇),-   a halogen atom, a cyano group, a nitro group,-   a substituted or unsubstituted aryl group including 6 to 50 ring    carbon atoms, or-   a substituted or unsubstituted monovalent heterocyclic group    including 5 to 50 ring atoms.

R₉₀₁ to R₉₀₇ are as defined in the formula (1).

In the formula (64), Ar₆₀₁ and Ar₆₀₂ are independently

-   a substituted or unsubstituted aryl group including 6 to 50 ring    carbon atoms, or-   a substituted or unsubstituted monovalent heterocyclic group    including 5 to 50 ring atoms.

L₆₀₁ to L₆₀₃ are independently

-   a single bond,-   a substituted or unsubstituted arylene group including 6 to 30 ring    carbon atoms,-   a substituted or unsubstituted divalent heterocyclic group including    5 to 30 ring atoms, or-   a divalent linking group formed by bonding two to four of these.

In the formula (61), the positions in which the divalent grouprepresented by the formula (62) and the divalent group represented bythe formula (63) are formed are not particularly limited, and thesegroups can be formed in any possible position of R₆₀₁ to R₆₀₈.

In one embodiment, the compound represented by the formula (61) is acompound represented by any of the following formulas (61-1) to (61-6).

In the formulas (61-1) to (61-6), X₆₀₁ is as defined in the formula(61).

At least two of R₆₀₁ to R₆₂₄ are a monovalent group represented by theformula (64).

R₆₀₁ to R₆₂₄ which are not a monovalent group represented by the formula(64) are independently

-   a hydrogen atom,-   a substituted or unsubstituted alkyl group including 1 to 50 carbon    atoms,-   a substituted or unsubstituted alkenyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted alkynyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted cycloalkyl group including 3 to 50    ring carbon atoms,-   —Si(R₉₀₁)(R₉₀₂)(R₉₀₃),-   —O—(R₉₀₄),-   —S—(R₉₀₅),-   —N(R₉₀₆)(R₉₀₇),-   a halogen atom, a cyano group, a nitro group,-   a substituted or unsubstituted aryl group including 6 to 50 ring    carbon atoms, or-   a substituted or unsubstituted monovalent heterocyclic group    including 5 to 50 ring atoms.

R₉₀₁ to R₉₀₇ are as defined in the formula (1).

In one embodiment, the compound represented by the formula (61) is acompound represented by any of the following formulas (61-7) to (61-18).

In the formulas (61-7) to (61-18), X₆₀₁ is as defined in the formula(61); “*” is a single bond which bonds with a monovalent grouprepresented by the formula (64); and R₆₀₁ to R₆₂₄ are the same as R₆₀₁to R₆₂₄ which are not a monovalent group represented by the formula(64).

R₆₀₁ to R₆₀₈ which do not form a divalent group represented by any ofthe formulas (62) and (63) and which are not a monovalent grouprepresented by the formula (64), and R₆₁₁ to R₆₁₄ and R₆₂₁ to R₆₂₄ whichare not

-   a monovalent group represented by the formula (64) are independently-   a hydrogen atom,-   a substituted or unsubstituted alkyl group including 1 to 50 carbon    atoms,-   a substituted or unsubstituted alkenyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted alkynyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted cycloalkyl group including 3 to 50    ring carbon atoms,-   a substituted or unsubstituted aryl group including 6 to 50 ring    carbon atoms, or-   a substituted or unsubstituted monovalent heterocyclic group    including 5 to 50 ring atoms.

The monovalent group represented by the formula (64) is preferablyrepresented by the following formula (65) or (66).

In the formula (65), R₆₃₁ to R₆₄₀ are independently

-   a hydrogen atom,-   a substituted or unsubstituted alkyl group including 1 to 50 carbon    atoms,-   a substituted or unsubstituted alkenyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted alkynyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted cycloalkyl group including 3 to 50    ring carbon atoms,-   —Si(R₉₀₁)(R₉₀₂)(R₉₀₃),-   —O—(R₉₀₄),-   —S—(R₉₀₅),-   —N(R₉₀₆)(R₉₀₇),-   a halogen atom, a cyano group, a nitro group,-   a substituted or unsubstituted aryl group including 6 to 50 ring    carbon atoms, or-   a substituted or unsubstituted monovalent heterocyclic group    including 5 to 50 ring atoms. R₉₀₁ to R₉₀₇ are as defined in the    formula (1).

In the formula (66), Ar₆₀₁, L₆₀₁, and L₆₀₃ are as defined in the formula(64). HAr₆₀₁ is a structure represented by the following formula (67).

In the formula (67), X₆₀₂ is an oxygen atom or a sulfur atom.

Any one of R₆₄₁ to R₆₄₈ is a single bond which bonds with L₆₀₃.

R₆₄₁ to R₆₄₈ which are not a single bond are independently

-   a hydrogen atom,-   a substituted or unsubstituted alkyl group including 1 to 50 carbon    atoms,-   a substituted or unsubstituted alkenyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted alkynyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted cycloalkyl group including 3 to 50    ring carbon atoms,-   —Si(R₉₀₁)(R₉₀₂)(R₉₀₃),-   —O—(R₉₀₄),-   —S—(R₉₀₅),-   —N(R₉₀₆)(R₉₀₇),-   a halogen atom, a cyano group, a nitro group,-   a substituted or unsubstituted aryl group including 6 to 50 ring    carbon atoms, or-   a substituted or unsubstituted monovalent heterocyclic group    including 5 to 50 ring atoms.

R₉₀₁ to R₉₀₇ are as defined in the formula (1).

Specific examples of the compound represented by the formula (61)include the following compounds, in addition to compounds described inWO 2014/104144A1. In the following specific examples, “Me” represents amethyl group.

(Compound Represented by the Formula (71))

A compound represented by the formula (71) will be described.

In the formula (71),

a ring A₇₀₁ and a ring A₇₀₂ are independently

-   a substituted or unsubstituted aromatic hydrocarbon ring including 6    to 50 ring carbon atoms, or-   a substituted or unsubstituted heterocyclic ring including 5 to 50    ring atoms.

One or more selected from the group consisting of the ring A701 and thering A702 are bonded with “*” in the structure represented by thefollowing formula (72).

In the formula (72),

a ring A₇₀₃ is

-   a substituted or unsubstituted aromatic hydrocarbon ring including 6    to 50 ring carbon atoms, or-   a substituted or unsubstituted heterocyclic ring including 5 to 50    ring atoms.

X₇₀₁ is NR₇₀₃, C(R₇₀₄)(R₇₀₅), Si(R₇₀₆)(R₇₀₇), Ge(R₇₀₈)(R₇₀₉), O, S, orSe.

R₇₀₁ and R₇₀₂ form a substituted or unsubstituted, saturated orunsaturated ring by bonding with each other, or do not form asubstituted or unsubstituted, saturated or unsaturated ring.

R₇₀₁ and R₇₀₂ which do not form the substituted or unsubstituted,saturated or unsaturated ring, and

R₇₀₃ to R₇₀₉ are independently

-   a hydrogen atom,-   a substituted or unsubstituted alkyl group including 1 to 50 carbon    atoms,-   a substituted or unsubstituted alkenyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted alkynyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted cycloalkyl group including 3 to 50    ring carbon atoms,-   —Si(R₉₀₁)(R₉₀₂)(R₉₀₃),-   —O—(R₉₀₄),-   —S—(R₉₀₅),-   —N(R₉₀₆)(R₉₀₇),-   a halogen atom, a cyano group, a nitro group,-   a substituted or unsubstituted aryl group including 6 to 50 ring    carbon atoms, or-   a substituted or unsubstituted monovalent heterocyclic group    including 5 to 50 ring atoms.

R₉₀₁ to R₉₀₇ are as defined in the formula (1).

One or more selected from the group consisting of the ring A₇₀₁ and thering A₇₀₂ are bonded with * in the structure represented by the formula(72). In other words, in one embodiment, ring carbon atoms of thearomatic hydrocarbon ring or ring atoms of the heterocyclic ring of thering A₇₀₁ is bonded with “*” in the structure represented by the formula(72). In addition, in one embodiment, ring carbon atoms of the aromatichydrocarbon ring or ring atoms of the heterocyclic ring of the ring A₇₀₂is bonded with “*” in the structure represented by the formula (72).

In one embodiment, a group represented by the following formula (73) isbonded with either or both of the ring A₇₀₁ and the ring A₇₀₂.

In the formula (73), Ar₇₀₁ and Ar₇₀₂ are independently

-   a substituted or unsubstituted aryl group including 6 to 50 ring    carbon atoms, or-   a substituted or unsubstituted monovalent heterocyclic group    including 5 to 50 ring atoms.

L₇₀₁ to L₇₀₃ are independently

-   a single bond,-   a substituted or unsubstituted arylene group including 6 to 30 ring    carbon atoms,-   a substituted or unsubstituted divalent heterocyclic group including    5 to 30 ring atoms, or-   a divalent linking group formed by bonding two to four of these.

In one embodiment, in addition to the ring A₇₀₁, ring carbon atoms ofthe aromatic hydrocarbon ring or ring atoms of the heterocyclic ring ofthe ring A₇₀₂ is bonded with “*” in the structure represented by theformula (72). In this case, the structures represented by the formula(72) may be the same or different.

In one embodiment, R₇₀₁ and R₇₀₂ are independently and a substituted orunsubstituted aryl group including 6 to 50 ring carbon atoms.

In one embodiment, R₇₀₁ and R₇₀₂ form a fluorene structure by bondingwith each other.

In one embodiment, the ring A₇₀₁ and the ring A₇₀₂ are substituted orunsubstituted aromatic hydrocarbon rings including 6 to 50 ring carbonatoms, and for example, substituted or unsubstituted benzene rings.

In one embodiment, the ring A₇₀₃ is a substituted or unsubstitutedaromatic hydrocarbon ring including 6 to 50 ring carbon atoms, and forexample, a substituted or unsubstituted benzene ring.

In one embodiment, X₇₀₁ is O or S.

Specific examples of the compound represented by the formula (71)include the following compounds.

In the following specific examples, “Me” represents a methyl group.

(Compound Represented by the Formula (81))

A compound represented by the formula (81) will be described.

In the formula (81),

a ring A₈₀₁ is a ring represented by the formula (82) which is fusedwith the adjacent ring at an arbitrary position.

A ring A₈₀₂ is a ring represented by the formula (83) which is fusedwith the adjacent ring at an arbitrary position. The two of “*” arebonded with the ring A₈₀₃ at arbitrary positions.

X₈₀₁ and X₈₀₂ are independently C(R₈₀₃)(R₈₀₄), Si(R₈₀₅)(R₈₀₆), an oxygenatom, a sulfur atom.

The ring A₈₀₃ is a substituted or unsubstituted aromatic hydrocarbonring including 6 to 50 ring carbon atoms or a substituted orunsubstituted heterocyclic ring including 5 to 50 ring atoms.

Ar₈₀₁ is a substituted or unsubstituted aryl group including 6 to 50ring carbon atoms, or a substituted or unsubstituted monovalentheterocyclic group including 5 to 50 ring atoms.

R₈₀₁ to R₈₀₆ are independently

-   a hydrogen atom,-   a substituted or unsubstituted alkyl group including 1 to 50 carbon    atoms,-   a substituted or unsubstituted alkenyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted alkynyl group including 2 to 50    carbon atoms,-   a substituted or unsubstituted cycloalkyl group including 3 to 50    ring carbon atoms,-   —Si(R₉₀₁)(R₉₀₂)(R₉₀₃),-   —O—(R₉₀₄),-   —S—(R₉₀₅),-   —N(R₉₀₆)(R₉₀₇),-   a halogen atom, a cyano group, a nitro group,-   a substituted or unsubstituted aryl group including 6 to 50 ring    carbon atoms, or-   a substituted or unsubstituted monovalent heterocyclic group    including 5 to 50 ring atoms.

R₉₀₁ to R₉₀₇ are as defined in the formula (1).

m801 and m802 are independently an integer of 0 to 2. When m801 and m802are 2, the plurality of each of R₈₀₁ or R₈₀₂ may be the same as ordifferent from each other.

a801 is an integer of 0 to 2. When a801 is 0 or 1, the structures inparentheses, which exist in number indicated by “3-a801 (3 subtracta801)” may be the same as or different from each other. When a801 is 2,Ar₈₀₁ may be the same as or different from each other.

In one embodiment, Ar₈₀₁ is a substituted or unsubstituted aryl groupincluding 6 to 50 ring carbon atoms.

In one embodiment, the ring A₈₀₃ is a substituted or unsubstitutedaromatic hydrocarbon ring including 6 to 50 ring carbon atoms, and is,for example, a substituted or unsubstituted benzene ring, a substitutedor unsubstituted naphthalene ring, or a substituted or unsubstitutedanthracene ring.

In one embodiment, R₈₀₃ and R₈₀₄ are independently a substituted orunsubstituted alkyl group including 1 to 50 carbon atoms.

In one embodiment, a801 is 1.

Specific examples of the compound represented by the formula (81)include the following compounds.

Specific examples of the above groups are as described in the section of[Definitions] of this specification.

(Compound Represented by the Formula (91))

A compound represented by formula (91) will be described.

In the formula (91),

any one or more sets selected from the group consisting of:

-   one or more sets of adjacent two or more of R₉₅₁ to R₉₆₀,-   one or more sets of adjacent two or more of R_(a1) to R_(a5), and-   one or more sets of adjacent two or more of R_(a6) to R_(a10)-   form a substituted or unsubstituted, saturated or unsaturated ring    including 3 to 30 ring atoms.

R₉₅₁ to R₉₆₀, R_(a1) to R_(a5), and R_(a6) to R_(a10) which are notinvolved in ring formation are independently

-   a hydrogen atom,-   a substituted or unsubstituted alkyl group including 1 to 30 carbon    atoms,-   a substituted or unsubstituted cycloalkyl group including 3 to 30    ring carbon atoms,-   a substituted or unsubstituted alkoxy group including 1 to 30 carbon    atoms,-   a substituted or unsubstituted alkylthio group including 1 to 30    carbon atoms,-   a substituted or unsubstituted amino group,-   a substituted or unsubstituted aryl group including 6 to 30 ring    carbon atoms,-   a substituted or unsubstituted heterocyclic group including 5 to 30    ring atoms,-   a substituted or unsubstituted alkenyl group including 2 to 30    carbon atoms,-   a substituted or unsubstituted aryloxy group including 6 to 30 ring    carbon atoms,-   a substituted or unsubstituted arylthio group including 6 to 30 ring    carbon atoms,-   a substituted or unsubstituted phosphanyl group,-   a substituted or unsubstituted phosphoryl group,-   a substituted or unsubstituted silyl group,-   a substituted or unsubstituted arylcarbonyl group including 6 to 30    ring carbon atoms,-   a cyano group, a nitro group, a carboxyl group, or-   a halogen atom.

At least one set of adjacent two or more of R₉₅₁ to R₉₅₆, R₉₅₇ to R₉₆₀,R_(a1) to R_(a5), and R_(a6) to R_(a10) form a ring by bonding with eachother.

Specific examples are described in which “one or more sets of adjacenttwo or more of R₉₅₁ to R₉₆₀, one or more sets of adjacent two or more ofR_(a1) to R_(a5), and one or more sets of adjacent two or more of Rae toR_(a10)” form a substituted or unsubstituted, saturated or unsaturatedring including 3 to 30 ring atoms.

A specific example in which adjacent two or more forms a ring by bondingwith each other, for example, includes the following substructure, bytaking R₉₅₇ to R₉₆₀ in the formula (91) as an example. In the followingpartial structure, adjacent three of R₉₅₈ and R₉₅₉ and R₉₆₀ form a ringby bonding with each other.

A specific example in which “one or more sets of adjacent two or more”forms a ring by bonding with each other, for example, includes thefollowing substructure, by taking R₉₅₁ to R₉₅₆ in the formula (91) as anexample. In the following partial structure, two sets of R₉₅₂ and R₉₅₃,and R₉₅₄ and R₉₅₅ form two separate rings by bonding with each other.

In one embodiment, R₉₅₂ and R₉₅₃ in the formula (91) form a substitutedor unsubstituted, saturated or unsaturated ring including 3 to 30 ringatoms by bonding with each other.

In one embodiment, the compound represented by the formula (91) is acompound represented by the following formula (91-1).

In the formula (91-1), R₉₅₁, and R₉₅₄ to R₉₆₀ are as defined in theformula (91).

R_(c1) and R_(c2) are independently

-   a hydrogen atom,-   an unsubstituted alkyl group including 1 to 50 carbon atoms,-   an unsubstituted alkenyl group including 2 to 50 carbon atoms,-   an unsubstituted alkynyl group including 2 to 50 carbon atoms,-   an unsubstituted cycloalkyl group including 3 to 50 ring carbon    atoms,-   —Si(R₉₀₁)(R₉₀₂)(R₉₀₃),-   —O—(R₉₀₄),-   —S—(R₉₀₅),-   —N(R₉₀₆)(R₉₀₇),-   a halogen atom, a cyano group, a nitro group,-   an unsubstituted aryl group including 6 to 50 ring carbon atoms, or-   an unsubstituted monovalent heterocyclic group including 5 to 50    ring atoms.

R₉₀₁ to R₉₀₇ are independently

-   a hydrogen atom,-   a substituted or unsubstituted alkyl group including 1 to 50 carbon    atoms,-   a substituted or unsubstituted cycloalkyl group including 3 to 50    ring carbon atoms,-   a substituted or unsubstituted aryl group including 6 to 50 ring    carbon atoms, or-   a substituted or unsubstituted monovalent heterocyclic group    including 5 to 50 ring atoms;

When two or more of each of R₉₀₁ to R₉₀₇ are present, the two or more ofeach of R₉₀₁ to R₉₀₇ may be the same as or different from each other.

In one embodiment, two or more of R₉₅₈ to R₉₆₀ in the formula (91) forma substituted or unsubstituted, saturated or unsaturated ring including3 to 30 ring atoms by bonding with each other.

In one embodiment, the compound represented by the formula (91) is acompound represented by the following formula (91-2).

In the formula (91-2), R₉₅₁ to R₉₅₇ are as defined in the formula (91).

In one embodiment, R₉₅₁ to R₉₆₀, R_(a1) to R_(a5), and R_(a6) to R_(a10)which are not involved in ring formation in the formula (91) areindependently

-   a hydrogen atom,-   an unsubstituted aryl group including 6 to 50 ring carbon atoms, or-   an unsubstituted monovalent heterocyclic group including 5 to 50    ring atoms.

Hereinafter, specific examples of the compound represented by theformula (91) will be described, but are illustrative only, and thecompound represented by the formula (91) is not limited to the followingspecific examples.

[Composition for Emitting Layer of Organic Electroluminescence Device]

Another aspect of the invention of a composition for an emitting layerof an organic electroluminescence device (hereinafter, abbreviated as acomposition for an emitting layer) contains

a first host material,

a second host material,

a dopant material, wherein

the first host material is a compound having at least one deuteriumatom, and

the first host material is comprised in the proportion of 1% by mass ormore.

The composition for an emitting layer can be preferably applied to forman emitting layer in the organic electroluminescence device describedabove, which contains the first host material, the second host material,and the dopant material wherein

the first host material has at least one deuterium atom, and

the first host material is comprised in the proportion of 1% by mass ormore.

Details of the first host material, the second host material, and thedopant material contained in the composition for an emitting layer aredescribed above.

As described above, the organic EL device according to an aspect of theinvention includes

an anode,

a cathode, and

at least one emitting layer between the anode and the cathode, wherein

the emitting layer contains a first host material, a second hostmaterial, and a dopant material,

the first host material is a compound having at least one deuteriumatom, and

known materials and known device configurations may be applied to theemitting layer, as long as the first host material is contained in aratio of 1% by mass or more and the effect of the invention is notimpaired.

Hereinafter, a layer configuration of the organic EL device according toone aspect of the invention will be described.

The organic EL device according to one aspect of the invention has anorganic layer between a pair of electrodes of a cathode and an anode.The organic layer contains at least one layer containing an organiccompound. Alternatively, the organic layer is formed by stacking aplurality of layers containing an organic compound. The organic layermay have a layer consisting only of one or more organic compounds. Theorganic layer may have a layer containing an organic compound and aninorganic compound together. The organic layer may have a layerconsisting only of one or more inorganic compounds.

At least one of the layers contained by the organic layer is an emittinglayer. The organic layer may be formed, for example, as one layer of theemitting layer, or may contain other layers which can be adopted in thelayer configuration of an organic EL device. Layers that can be employedin the layer configuration of an organic EL device include, but are notlimited to, a hole-transporting region (a hole-transporting layer, ahole-injecting layer, an electron-blocking layer, an exciton-blockinglayer, etc.) provided between an anode and an emitting layer; anemitting layer; a spacing layer; an electron-transporting region (anelectron-transporting layer, an electron-injecting layer, ahole-blocking layer, etc.) provided between a cathode and an emittinglayer, and the like.

The organic EL device according to one aspect of the invention may be,for example, a monochromatic emitting device of a fluorescent orphosphorescent type, or a white emitting device of afluorescent/phosphorescent hybrid type. In addition, it may be a simpletype containing a single light emitting unit or a tandem type containinga plurality of light emitting units.

The “emitting unit” refers to the smallest unit which contains organiclayers, in which at least one of the organic layers is an emittinglayer, and which emits light by recombination of injected holes andelectrons.

The “emitting layer” described in this specification is an organic layerhaving an emitting function. The emitting layer is, for example, aphosphorescent emitting layer, a fluorescent emitting layer, or thelike, and may be a single layer or a plurality of layers.

The light-emitting unit may be of a stacked type containing a pluralityof a phosphorescent emitting layer and a fluorescent emitting layer, andin this case, for example, may contain a spacing layer between theemitting layers for preventing excitons generated by the phosphorescentemitting layer from diffusing into the fluorescent emitting layer.

The simple type organic EL device includes, for example, a deviceconfiguration such as anode/emitting unit/cathode.

Typical layer configurations of the emitting unit are shown below. Thelayers in parentheses are optional layers.

-   (a) (hole-injecting layer/) hole-transporting layer/fluorescent    emitting layer (/electron-transporting layer/electron-injecting    layer)-   (b) (hole-injecting layer/) hole-transporting layer/phosphorescent    emitting layer (/electron-transporting layer/electron-injecting    layer)-   (c) (hole-injecting layer) hole-transporting layer/first fluorescent    emitting layer/second fluorescent emitting layer    (/electron-transporting layer/electron-injecting layer)-   (d) (hole-injecting layer/) hole-transporting layer/first    phosphorescent emitting layer/second phosphorescent emitting layer    (/electron-transporting layer/electron-injecting layer)-   (e) (hole-injecting layer/) hole-transporting layer/phosphorescent    emitting layer/spacing layer/fluorescent emitting layer    (/electron-transporting layer/electron-injecting layer)-   (f) (hole-injecting layer/) hole-transporting layer/first    phosphorescent emitting layer/second phosphorescent emitting    layer/spacing layer/fluorescent emitting layer    (/electron-transporting layer/electron-injecting layer)-   (g) (hole-injecting layer/) hole-transporting layer/first    phosphorescent layer/spacing layer/second phosphorescent emitting    layer/spacing layer/fluorescent emitting layer    (/electron-transporting layer/electron-injecting layer)-   (h) (hole-injecting layer/) hole-transporting layer/phosphorescent    emitting layer/spacing layer/first fluorescent emitting layer/second    fluorescent emitting layer (/electron-transporting    layer/electron-injecting layer)-   (i) (hole-injecting layer/) hole-transporting    layer/electron-blocking layer/fluorescent emitting layer    (/electron-transporting layer/electron-injecting layer)-   (j) (hole-injecting layer/) hole-transporting    layer/electron-blocking layer/phosphorescent emitting layer    (/electron-transporting layer/electron-injecting layer)-   (k) (hole-injecting layer) hole-transporting layer/exciton-blocking    layer/fluorescent emitting layer (/electron-transporting    layer/electron-injecting layer)-   (l) (hole-injecting layer/) hole-transporting layer/exciton-blocking    layer/phosphorescent emitting layer (/electron-transporting    layer/electron-injecting layer)-   (m) (hole-injecting layer/first hole-transporting layer/second    hole-transporting layer/fluorescent emitting layer    (/electron-transporting layer/electron-injecting layer)-   (n) (hole-injecting layer/first hole-transporting layer/second    hole-transporting layer/fluorescent emitting layer (/first    electron-transporting layer/second electron-transporting    layer/electron-injecting layer)-   (o) (hole-injecting layer/first hole-transporting layer/second    hole-transporting layer/phosphorescent emitting layer    (/electron-transporting layer/electron-injecting layer)-   (p) (hole-injecting layer/first hole-transporting layer/second    hole-transporting layer/phosphorescent emitting layer (/first    electron-transporting layer/second electron-transporting    layer/electron-injecting layer)-   (q) (hole-injecting layer/) hole-transporting layer/fluorescent    emitting layer/hole-blocking layer (/electron-transporting    layer/electron-injecting layer)-   (r) (hole-injecting layer/) hole-transporting layer/phosphorescent    emitting layer/hole-blocking layer (/electron-transporting    layer/electron-injecting layer)-   (s) (hole-injecting layer/) hole-transporting layer/fluorescent    emitting layer/exciton-blocking layer (/electron-transporting    layer/electron-injecting layer)-   (t) (hole-injecting layer/) hole-transporting layer/phosphorescent    emitting layer/exciton-blocking layer (/electron-transporting    layer/electron-injecting layer)

However, the layer configuration of the organic EL device according toone aspect of the invention is not limited thereto. For example, whenthe organic EL device has a hole-injecting layer and a hole-transportinglayer, it is preferred that a hole-injecting layer be provided betweenthe hole-transporting layer and the anode.

Further, when the organic EL device has an electron-injecting layer andan electron-transporting layer, it is preferred that anelectron-injecting layer be provided between the electron-transportinglayer and the cathode.

Further, each of the hole-injecting layer, the hole-transporting layer,the electron-transporting layer and the electron-injecting layer may beconstituted of a single layer or of a plurality of layers.

The plurality of phosphorescent emitting layers, and the plurality ofthe phosphorescent emitting layer and the fluorescent emitting layer maybe emitting layers that emit mutually different colors. For example, theemitting unit (f) may contain a hole-transporting layer/firstphosphorescent layer (red light emission)/second phosphorescent emittinglayer (green light emission)/spacing layer/fluorescent emitting layer(blue light emission)/electron-transporting layer.

An electron-blocking layer may be provided between each light emittinglayer and the hole-transporting layer or the spacing layer. Further, ahole-blocking layer may be provided between each emitting layer and theelectron-transporting layer. By providing the electron-blocking layer orthe hole-blocking layer, it is possible to confine electrons or holes inthe emitting layer, thereby to improve the recombination probability ofcarriers in the emitting layer, and to improve luminous efficiency.

As a representative device configuration of a tandem type organic ELdevice, for example, a device configuration such as anode/first emittingunit/intermediate layer/second emitting unit/cathode can be given.

The first emitting unit and the second emitting unit are independentlyselected from the above-mentioned emitting units, for example.

The intermediate layer is also generally referred to as an intermediateelectrode, an intermediate conductive layer, a charge generating layer,an electron withdrawing layer, a connecting layer, a connector layer, oran intermediate insulating layer. The intermediate layer is a layer thatsupplies electrons to the first emitting unit and holes to the secondemitting unit, and can be formed of known materials.

Hereinbelow, an explanation will be made on function, materials, etc. ofeach layer constituting the organic EL device described in thisspecification.

(Substrate)

The substrate is used as a support of the organic EL device. Thesubstrate preferably has a light transmittance of 50% or more in thevisible light region within a wavelength of 400 to 700 nm, and a smoothsubstrate is preferable. Examples of the material of the substrateinclude soda-lime glass, aluminosilicate glass, quartz glass, plasticand the like. As the substrate, a flexible substrate can be used. Theflexible substrate means a substrate that can be bent (flexible), andexamples thereof include a plastic substrate and the like. Specificexamples of the material for forming the plastic substrate includepolycarbonate, polyallylate, polyether sulfone, polypropylene,polyester, polyvinyl fluoride, polyvinyl chloride, polyimide,polyethylene naphthalate and the like. Also, an inorganic vapordeposited film can be used.

(Anode)

As the anode, for example, it is preferable to use a metal, an alloy, aconductive compound, a mixture thereof or the like, which has a highwork function (specifically, 4.0 eV or more). Specific examples of thematerial of the anode include indium oxide-tin oxide (ITO: Indium TinOxide), indium oxide-tin oxide containing silicon or silicon oxide,indium oxide-zinc oxide, indium oxide containing tungsten oxide or zincoxide, graphene and the like. In addition, it is possible to use gold,silver, platinum, nickel, tungsten, chromium, molybdenum, iron, cobalt,copper, palladium, titanium, nitrides of these metals (e.g. titaniumnitride) and the like.

The anode is normally formed by depositing these materials on thesubstrate by a sputtering method. For example, indium oxide-zinc oxidecan be formed by a sputtering method by using a target in which 1 to 10mass % zinc oxide is added to indium oxide. Further, indium oxidecontaining tungsten oxide or zinc oxide can be formed by a sputteringmethod by using a target in which 0.5 to 5 mass % of tungsten oxide or0.1 to 1 mass % of zinc oxide is added to indium oxide.

As the other methods for forming the anode, a vacuum deposition method,a coating method, an inkjet method, a spin coating method or the likecan be given. When silver paste or the like is used, it is possible touse a coating method, an inkjet method or the like.

The hole-injecting layer formed in contact with the anode is formed byusing a material that allows easy hole injection regardless of the workfunction of the anode. For this reason, in the anode, it is possible touse a common electrode material, for example, a metal, an alloy, aconductive compound and a mixture thereof.

Specifically, materials having a small work function such as alkalinemetals such as lithium and cesium; magnesium; alkaline earth metals suchas calcium and strontium; alloys containing these metals (for example,magnesium-silver and aluminum-lithium); rare earth metals such aseuropium and ytterbium; and an alloy containing rare earth metals canalso be used for the anode.

(Hole-Injecting Layer)

A hole-injecting layer is a layer that contains a substance having ahigh hole-injecting property and has a function of injecting holes fromthe anode to the organic layer. As the substance having a highhole-injecting property, molybdenum oxide, titanium oxide, vanadiumoxide, rhenium oxide, ruthenium oxide, chromium oxide, zirconium oxide,hafnium oxide, tantalum oxide, silver oxide, tungsten oxide, manganeseoxide, an aromatic amine compound, an electron-attracting (acceptor)compound, a polymeric compound (oligomer, dendrimer, polymer, etc.) andthe like can be given. Among these, an aromatic amine compound and anacceptor compound are preferable, with an acceptor compound being morepreferable.

Specific examples of the aromatic amine compound include4,4′,4″-tris(N,N-diphenylamino)triphenylamine (abbreviation: TDATA),4,4′,4″-tris[N-(3-methylphenyl)-N-phenylamino]triphenylamine(abbreviation: MTDATA),4,4′-bis[N-(4-diphenylaminophenyl)-N-phenylamino]biphenyl (abbreviation:DPAB),4,4′-bis(N-{4-[N′-(3-methylphenyl)-N′-phenylamino]phenyl}-N-phenylamino)biphenyl(abbreviation: DNTPD),1,3,5-tris[N-(4-diphenylaminophenyl)-N-phenylamino]benzene(abbreviation: DPA3B),3-[N-(9-phenylcarbazol-3-yl)-N-phenylamino]-9-phenylcarbazole(abbreviation: PCzPCA1),3,6-bis[N-(9-phenylcarbazol-3-yl)-N-phenylamino]-9-phenylcarbazole(abbreviation: PCzPCA2),3-[N-(1-naphthyl)-N-(9-phenylcarbazol-3-yl)amino]-9-phenylcarbazole(abbreviation: PCzPCN1), and the like.

The acceptor compound is preferably, for example, a heterocyclic ringderivative having an electron-attracting group, a quinone derivativehaving an electron-attracting group, an arylborane derivative, aheteroarylborane derivative, and the like, and specific examples includehexacyanohexaazatriphenylene,2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (abbreviation:F4TCNQ),1,2,3-tris[(cyano)(4-cyano-2,3,5,6-tetrafluorophenyl)methylene]cydopropane,and the like.

When the acceptor compound is used, it is preferred that thehole-injecting layer further comprise a matrix material. As the matrixmaterial, a material known as the material for an organic EL device canbe used.

For example, an electron-donating (donor) compound is preferable.

(Hole-Transporting Layer) The hole-transporting layer is a layer thatcomprises a high hole-transporting property, and has a function oftransporting holes from the anode to the organic layer.

As the substance having a high hole-transporting property, a substancehaving a hole mobility of 10⁻⁶ cm²/(V·s) or more is preferable. Forexample, an aromatic amine compound, a carbazole derivative, ananthracene derivative, a polymeric compound, and the like can be given.

Specific examples of the aromatic amine compound include4,4′-bis[N-(1-naphthyl)-N-phenylamino]biphenyl (abbreviation: NPB),N,N′-bis(3-methylphenyl)-N,N′-diphenyl-[1,1′-biphenyl]-4,4′-diamine(abbreviation: TPD), 4-phenyl-4′-(9-phenylfluoren-9-yl)triphenylamine(abbreviation: BAFLP),4,4′-bis[N-(9,9-dimethylfluoren-2-yl)-N-phenylamino]biphenyl(abbreviation: DFLDPBi), 4,4′,4″-tris(N,N-diphenylamino)triphenylamine(abbreviation: TDATA),4,4′,4″-tris[N-(3-methylphenyl)-N-phenylamino]triphenylamine(abbreviation: MTDATA),4,4′-bis[N-(spiro-9,9′-bifluoren-2-yl)-N-phenylamino]biphenyl(abbreviation: BSPB), and the like.

Specific examples of the carbazole derivative include4,4′-di(9-carbazolyl)biphenyl (abbreviation: CBP),9-[4-(9-carbazolyl)phenyl]-10-phenylanthracene (abbreviation: CzPA),9-phenyl-3-[4-(10-phenyl-9-anthryl)phenyl]-9H-carbazole (abbreviation:PCzPA) and the like.

Specific examples of the anthracene derivative include2-t-butyl-9,10-di(2-naphthyl)anthracene (t-BuDNA),9,10-di(2-naphthyl)anthracene (DNA), 9,10-diphenylanthracene (DPAnth),and the like.

Specific examples of the polymeric compound includepoly(N-vinylcarbazole) (abbreviation: PVK), poly(4-vinyltriphenylamine)(abbreviation: PVTPA) and the like.

As long as a compound other than those mentioned above, that has ahigher hole-transporting property as compared with electron-transportingproperty, such a compound can be used for the hole-transporting layer.

The hole-transporting layer may be a single layer or may be a stackedlayer of two or more layers. In this case, it is preferred to arrange alayer that contains a substance having a larger energy gap amongsubstances having a higher hole-transporting property, on a side nearerto the emitting layer.

(Emitting Layer)

The emitting layer is a layer containing a substance having a highemitting property (dopant material). As the dopant material, varioustypes of material can be used. For example, a fluorescent emittingcompound (fluorescent dopant), a phosphorescent emitting compound(phosphorescent dopant) or the like can be used. A fluorescent emittingcompound is a compound capable of emitting light from the singletexcited state, and an emitting layer containing a fluorescent emittingcompound is called as a fluorescent emitting layer. Further, aphosphorescent emitting compound is a compound capable of emitting lightfrom the triplet excited state, and an emitting layer containing aphosphorescent emitting compound is called as a phosphorescent emittinglayer.

The emitting layer contains a dopant material and a host material thatallows the dopant material to emit light efficiently. In someliteratures, a dopant material is called as a guest material, an emitteror an emitting material. In some literatures, a host material is calledas a matrix material.

A single emitting layer may comprise plural dopant materials. Further,plural emitting layers may be present.

In this specification, a host material combined with the fluorescentdopant is referred to as a “fluorescent host” and a host materialcombined with the phosphorescent dopant is referred to as the“phosphorescent host”. Note that the fluorescent host and thephosphorescent host are not classified only by the molecular structure.The phosphorescent host is a material for forming a phosphorescentemitting layer containing a phosphorescent dopant, but it does not meanthat it cannot be used as a material for forming a fluorescent emittinglayer. The same can be applied to the fluorescent host.

The content of the dopant material in the emitting layer is notparticularly limited, but from the viewpoint of adequate luminescenceand concentration quenching, it is preferable, for example, to be 0.1 to70 mass %, more preferably 0.1 to 30 mass %, more preferably 1 to 30mass %, still more preferably 1 to 20 mass %, and particularlypreferably 1 to 10 mass %.

<Fluorescent Dopant>

As the fluorescent dopant, a fused polycyclic aromatic derivative, astyrylamine derivative, a fused ring amine derivative, aboron-containing compound, a pyrrole derivative, an indole derivative, acarbazole derivative can be given, for example. Among these, a fusedring amine derivative, a boron-containing compound, and a carbazolederivative are preferable.

As the fused ring amine derivative, a diaminopyrene derivative, adiaminochrysene derivative, a diaminoanthracene derivative, adiaminofluorene derivative, a diaminofluorene derivative with which oneor more benzofuro skeletons are fused, and the like can be given.

As the boron-containing compound, a pyrromethene derivative, atriphenylborane derivative and the like can be given.

Examples of the blue fluorescent dopant include a pyrene derivative, astyrylamine derivative, a chrysene derivative, a fluoranthenederivative, a fluorene derivative, a diamine derivative, a triarylaminederivative, and the like. Specifically,N,N′-bis[4-(9H-carbazol-9-yl)phenyl]-N,N′-diphenylstilbene-4,4′-diamine(abbreviation: YGA2S),4-(9H-carbazol-9-yl)-4′-(10-phenyl-9-anthryl)triphenylamine(abbreviation: YGAPA),4-(10-phenyl-9-anthryl)-4′-(9-phenyl-9H-carbazol-3-yl)triphenylamine(abbreviation: PCBAPA) and the like can be given.

As the green fluorescent dopant, an aromatic amine derivative and thelike can be given, for example. Specifically,N-(9,10-diphenyl-2-anthryl)-N,9-diphenyl-9H-carbazol-3-amine(abbreviation: 2PCAPA),N-[9,10-bis(1,1′-biphenyl-2-yl)-2-anthryl]-N,9-diphenyl-9H-carbazol-3-amine(abbreviation: 2PCABPhA),N-(9,10-diphenyl-2-anthryl)-N,N′,N′-triphenyl-1,4-phenylenediamine(abbreviation: 2DPAPA),N-[9,10-bis(1,1′-biphenyl-2-yl)-2-anthryl]-N,N′,N′-triphenyl-1,4-phenylenediamine(abbreviation: 2DPABPhA),N-[9,10-bis(1,1′-biphenyl-2-yl)]-N-[4-(9H-carbazol-9-yl)phenyl]-N-phenylanthracene-2-amine (abbreviation: 2YGABPhA),N,N,9-triphenylanthracene-9-amine (abbreviation: DPhAPhA), and the likecan be given.

As the red fluorescent dopant, a tetracene derivative, a diaminederivative or the like can be given. Specifically,N,N,N′,N′-tetrakis(4-methylphenyl)tetracen-5,11-diamine (abbreviation:p-mPhTD),7,14-diphenyl-N,N,N′,N′-tetrakis(4-methylphenyl)acenaphtho[1,2-a]fluoranthen-3,10-diamine(abbreviation: p-mPhAFD) and the like can be given.

<Phosphorescent Dopant>

As the phosphorescent dopant, a phosphorescent light-emitting heavymetal complex and a phosphorescent light-emitting rare earth metalcomplex can be given.

As the heavy metal complex, an iridium complex, an osmium complex, aplatinum complex and the like can be given. As the heavy metal complex,an ortho-metalated complex of a metal selected from iridium, osmium andplatinum.

As the rare earth metal complexes include a terbium complex, a europiumcomplex and the like. Specifically,tris(acetylacetonate)(monophenanthroline)terbium (III) (abbreviation:Tb(acac)₃(Phen)),tris(1,3-diphenyl-1,3-propandionate)(monophenanthroline)europium (III)(abbreviation: Eu(DBM)₃(Phen)),tris[1-(2-thenoyl)-3,3,3-trifluoroacetonate](monophenanthroline)europium(III) (abbreviation: Eu(TTA)₃(Phen)) and the like can be given. Theserare earth metal complexes are preferable as phosphorescent dopantssince rare earth metal ions emit light due to electronic transitionbetween different multiplicity.

As the blue phosphorescent dopant, an iridium complex, an osmiumcomplex, a platinum complex, or the like can be given, for example.Specific examples includebis[2-(4′,6′-difluorophenyl)pyridinato-N,C2′]iridium (III)tetrakis(1-pyrazolyl)borate (abbreviation: Flr6),bis[2-(4′,6′-difluorophenyl)pyridinato-N,C2′]iridium (III) picolinate(abbreviation: Flrpic),bis[2-(3′,5′-bistrofluoromethylphenyl)pyridinato-N,C2′]iridium (III)picolinate (abbreviation: Ir(CF₃ppy)₂(pic)),bis[2-(4′,6′-difluorophenyl)pyridinato-N,C2′]iridium (III)acetylacetonate (abbreviation: Flracac), and the like.

As the green phosphorescent dopant, an iridium complex or the like canbe given, for example. Specific examples includetris(2-phenylpyridinato-N,C2′)iridium (III) (abbreviation: Ir(ppy)₃),bis(2-phenylpyridinato-N,C2′)iridium (III) acetylacetonate(abbreviation: Ir(ppy)₂(acac)), bis(1,2-diphenyl-1Hbenzimidazolate)iridium (III) acetylacetonate (abbreviation:Ir(pbi)₂(acac)), bis(benzo[h]quinolinato)iridium (III) acetylacetonate(abbreviation: Ir(bzq)₂(acac)), and the like.

As the red phosphorescent dopant, an iridium complex, a platinumcomplex, a terbium complex, a europium complex and the like can begiven. Specifically,bis[2-(2′-benzo[4,5-α]thienyl)pyridinato-N,C3′]iridium (III)acetylacetonate (abbreviation: Ir(btp)₂(acac)),bis(1-phenylisoquinolinato-N,C2′)iridium (III) acetylacetonate(abbreviation: Ir(piq)₂(acac)),(acetylacetonate)bis[2,3-bis(4-fluorophenyl)quinoxalinato]iridium (III)(abbreviation: Ir(Fdpq)₂(acac)),2,3,7,8,12,13,17,18-octaethyl-21H,23H-porphyrin platinum (II)(abbreviation: PtOEP), and the like.

<Host Material>

Examples of the host material include metal complexes such as analuminum complex, a beryllium complex, and a zinc complex; heterocycliccompounds such as an indole derivative, a pyridine derivative, apyrimidine derivative, a triazine derivative, a quinoline derivative, anisoquinoline derivative, a quinazoline derivative, a dibenzofuranderivative, a dibenzothiophene derivative, an oxadiazole derivative, abenzimidazole derivative, a phenanthroline derivative; fused aromaticcompounds such as a naphthalene derivative, a triphenylene derivative, acarbazole derivative, an anthracene derivative, a phenanthrenederivative, a pyrene derivative, a chrysene derivative, a naphthacenederivative, and a fluoranthene derivative; and aromatic amine compoundssuch as a triarylamine derivative, and a fused polycyclic aromatic aminederivative, and the like. Plural types of host materials can be used incombination.

Specific examples of the metal complex includetris(8-quinolinolato)aluminum(III) (abbreviation: Alq),tris(4-methyl-8-quinolinolato)aluminum(III) (abbreviation: Almq3),bis(10-hydroxybenzo[h]quinolinato)beryllium(II) (abbreviation: BeBq2),bis(2-methyl-8-quinolinolato)(4-phenylphenolato)aluminum(III)(abbreviation: BAlq), bis(8-quinolinolato)zinc(II) (abbreviation: Znq),bis[2-(2-benzoxazolyl)phenolato]zinc(II) (abbreviation: ZnPBO),bis[2-(2-benzothiazolyl) phenolato]zinc(II) (abbreviation: ZnBTZ), andthe like.

Specific examples of the heterocyclic compound include2-(4-biphenylyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole (abbreviation:PBD), 1,3-bis[5-(p-tert-butylphenyl)-1,3,4-oxadiazol-2-yl]benzene(abbreviation: OXD-7),3-(4-biphenylyl)-4-phenyl-5-(4-tert-butylphenyl)-1,2,4-tiazole(abbreviation: TAZ),2,2′,2″-(1,3,5-benzenetriyl)tris(1-phenyl-1H-benzimidazole)(abbreviation: TPBI), bathophenanthroline (abbreviation: BPhen),bathocuproine (abbreviation: BCP), and the like.

Specific examples of the fused aromatic compound include9-[4-(10-phenyl-9-anthryl)phenyl]-9H-carbazole (abbreviation: CzPA),3,6-diphenyl-9-[4-(10-phenyl-9-anthryl)phenyl]-9H-carbazole(abbreviation: DPCzPA), 9,10-bis(3,5-diphenylphenyl)anthracene(abbreviation: DPPA), 9,10-di(2-naphthyl)anthracene (abbreviation: DNA),2-tert-butyl-9,10-di(2-naphthyl)anthracene (abbreviation: t-BuDNA),9,9′-bianthryl (abbreviation: BANT),9,9′-(stilbene-3,3′-diyl)diphenanthrene (abbreviation: DPNS),9,9′-(stilbene-4,4′-diyl)diphenanthrene (abbreviation: DPNS2),3,3′,3″-(benzene-1,3,5-triyl)tripyrene (abbreviation: TPB3),9,10-diphenylanthracene (abbreviation: DPAnth),6,12-dimethoxy-5,11-diphenylchrysene, and the like.

Specific examples of the aromatic amine compound includeN,N-diphenyl-9-[4-(10-phenyl-9-anthryl)phenyl]-9H-carbazol-3-amine(abbreviation: CzA1PA), 4-(10-phenyl-9-anthryl)triphenylamine(abbreviation: DPhPA),N,9-diphenyl-N-[4-(10-phenyl-9-anthryl)phenyl]-9H-carbazol-3-amine(abbreviation: PCAPA),N,9-diphenyl-N-{4-[4-(10-phenyl-9-anthryl)phenyl]phenyl}-9H-carbazol-3-amine(abbreviation: PCAPBA),N-(9,10-diphenyl-2-anthryl)-N,9-diphenyl-9H-carbazol-3-amine(abbreviation: 2PCAPA), 4,4′-bis[N-(1-naphthyl)-N-phenylamino]biphenyl(abbreviation: NPB or α-NPD),N,N′-bis(3-methylphenyl)-N,N′-diphenyl-[1,1′-biphenyl]-4,4′-diamine(abbreviation: TPD),4,4′-bis[N-(9,9-dimethylfluoren-2-yl)-N-phenylamino]biphenyl(abbreviation: DFLDPBi),4,4′-bis[N-(spiro-9,9′-bifluoren-2-yl)-N-phenylamino]biphenyl(abbreviation: BSPB), and the like.

As the fluorescent host, a compound having a higher singlet energy levelas compared with a fluorescent dopant is preferable. For example, aheterocyclic compound, a fused aromatic compound and the like can begiven.

As the phosphorescent host, a compound having a higher triplet energylevel as compared with a phosphorescent dopant is preferable. Forexample, a metal complex, a heterocyclic compound, a fused aromaticcompound and the like can be given. Among these, an indole derivative, acarbazole derivative, a pyridine derivative, a pyrimidine derivative, atriazine derivative, a quinoline derivative, an isoquinoline derivative,a quinazoline derivative, a dibenzofuran derivative, a dibenzothiophenederivative, a naphthalene derivative, a triphenylene derivative, aphenanthrene derivative, a fluoranthene derivative and the like arepreferable.

(Electron-Transporting Layer)

An electron-transporting layer is a layer that comprises a substancehaving a high electron-transporting property. As the substance having ahigh electron-transporting property, a substance having an electronmobility of 10⁻⁶ cm²Vs or more is preferable. For example, a metalcomplex, an aromatic heterocyclic compound, an aromatic hydrocarboncompound, a polymeric compound and the like can be given.

As the metal complex, an aluminum complex, a beryllium complex, a zinccomplex and the like can be given. Specific examples of the metalcomplex include tris(8-quinolinolato)aluminum (III) (abbreviation: Alq),tris(4-methyl-8-quinolinolato)aluminum (abbreviation: Almq3),bis(10-hydroxybenzo[h]quinolinato)beryllium (abbreviation: BeBq2),bis(2-methyl-8-quinolinolato)(4-phenylphenolato)aluminum (III)(abbreviation: BAlq), bis(8-quinolinolato)zinc (II) (abbreviation: Znq),bis[2-(2-benzoxazolyl)phenolato]zinc (II) (abbreviation: ZnPBO),bis[2-(2-benzothiazolyl) phenolato]zinc(II) (abbreviation: ZnBTZ), andthe like.

As the aromatic heterocyclic compound, imidazole derivatives such as abenzimidazole derivative, an imidazopyridine derivative and abenzimidazophenanthridine derivative; azine derivatives such as apyrimidine derivative and a triazine derivative; compounds having anitrogen-containing 6-membered ring structure such as a quinolinederivative, an isoquinoline derivative, and a phenanthroline derivative(also including one having a phosphine oxide-based substituent on theheterocyclic ring) and the like can be given. Specifically,2-(4-biphenylyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole (abbreviation:PBD), 1,3-bis[5-(p-tert-butylphenyl)-1,3,4-oxadiazol-2-yl]benzene(abbreviation: OXD-7),3-(4-tert-butylphenyl)-4-phenyl-5-(4-biphenylyl)-1,2,4-triazole(abbreviation: TAZ),3-(4-tert-butylphenyl)-4-(4-ethylphenyl)-5-(4-biphenylyl)-1,2,4-triazole(abbreviation: p-EtTAZ), bathophenanthroline (abbreviation: BPhen),bathocuproine (abbreviation: BCP),4,4′-bis(5-methylbenzoxazol-2-yl)stilbene (abbreviation: BzOs), and thelike can be given.

As the aromatic hydrocarbon compound, an anthracene derivative, afluoranthene derivative and the like can be given, for example.

As specific examples of the polymeric compound,poly[(9,9-dihexylfluoren-2,7-diyl)-co-(pyridine-3,5-diyl)](abbreviation: PF-Py),poly[(9,9-dioctylfluoren-2,7-diyl)-co-(2,2′-bipyridin-6,6′-diyl)](abbreviation: PF-BPy) and the like can be given.

As long as a compound other than those mentioned above, that has ahigher electron-transporting property as compared with hole-transportingproperty, such a compound may be used in the electron-transportinglayer.

The electron-transporting layer may be a single layer, or a stackedlayer of two or more layers. In this case, it is preferable to arrange alayer that contains a substance having a larger energy gap, amongsubstances having a high electron-transporting property, on the sidenearer to the emitting layer.

The electron-transporting layer may contain a metal such as an alkalimetal, magnesium, an alkaline earth metal, or an alloy containing two ormore of these metals; a metal compound such as an alkali metal compoundsuch as 8-quinolinolato lithium (Liq), or an alkaline earth metalcompound. When a metal such as an alkali metal, magnesium, an alkalineearth metal, or an alloy containing two or more of these metals iscontained in the electron-transporting layer, the content of the metalis not particularly limited, but is preferably from 0.1 to 50 mass %,more preferably from 0.1 to 20 mass %, further preferably from 1 to 10mass %.

When a metal compound such as an alkali metal compound or an alkalineearth metal compound is contained in the electron-transporting layer,the content of the metal compound is preferably from 1 to 99 mass %,more preferably from 10 to 90 mass %. When plural electron-transportinglayers are provided, the layer on the emitting layer side can be formedonly from the metal compound as mentioned above.

(Electron-Injecting Layer)

The electron-injecting layer is a layer that contains a substance havinga high electron-injecting property, and has the function of efficientlyinjecting electrons from a cathode to an emitting layer. Examples of thesubstance that has a high electron-injecting property include an alkalimetal, magnesium, an alkaline earth metal, a compound thereof, and thelike. Specific examples thereof include lithium, cesium, calcium,lithium fluoride, cesium fluoride, calcium fluoride, lithium oxide, andthe like. In addition, a material in which an alkali metal, magnesium,an alkaline earth metal, or a compound thereof is incorporated to anelectron-transporting substance having an electron-transportingproperty, for example, Alq incorporated with magnesium, may also beused.

Alternatively, a composite material that includes an organic compoundand a donor compound may also be used in the electron-injecting layer.Such a composite material is excellent in the electron-injectingproperty and the electron-transporting property since the organiccompound receives electrons from the donor compound.

The organic compound is preferably a substance excellent in transportingproperty of the received electrons, and specifically, for example, themetal complex, the aromatic heterocyclic compound, and the like, whichare a substance that has a high electron-transporting property asmentioned above, can be used.

Any material capable of donating electrons to an organic compound can beused as the donor compound. Examples thereof include an alkali metal,magnesium, an alkaline earth metal, a rare earth metal and the like.Specific examples thereof include lithium, cesium, magnesium, calcium,erbium, ytterbium, and the like. Further, an alkali metal oxide and analkaline earth metal oxide are preferred, and examples thereof includelithium oxide, calcium oxide, barium oxide, and the like. Lewis basessuch as magnesium oxide can also be used. Alternatively, an organiccompound such as tetrathiafulvalene (abbreviation: TTF) can be used.

(Cathode)

For the cathode, a metal, an alloy, an electrically conductive compound,and a mixture thereof, each having a small work function (specifically,a work function of 3.8 eV or less) are preferably used. Specificexamples of the material for the cathode include alkali metals such aslithium and cesium; magnesium; alkaline earth metals such as calcium,and strontium; alloys containing these metals (for example,magnesium-silver, and aluminum-lithium); rare earth metals such aseuropium and ytterbium; alloys containing a rare earth metal, and thelike.

The cathode is usually formed by a vacuum vapor deposition or asputtering method. Further, in the case of using a silver paste or thelike, a coating method, an inkjet method, or the like can be employed.

In the case where the electron-injecting layer is provided, a cathodecan be formed from a substance selected from various electricallyconductive materials such as aluminum, silver, ITO, graphene, indiumoxide-tin oxide containing silicon or silicon oxide, regardless of thework function value. These electrically conductive materials are madeinto films by using a sputtering method, an inkjet method, a spincoating method, or the like.

(Insulating Layer)

In the organic EL device, pixel defects based on leakage or a shortcircuit are easily generated since an electric field is applied to athin film. In order to prevent this, an insulating thin layer may beinserted between a pair of electrodes.

Examples of substances used for the insulating layer include aluminumoxide, lithium fluoride, lithium oxide, cesium fluoride, cesium oxide,magnesium oxide, magnesium fluoride, calcium oxide, calcium fluoride,aluminum nitride, titanium oxide, silicon oxide, germanium oxide,silicon nitride, boron nitride, molybdenum oxide, ruthenium oxide,vanadium oxide, and the like. A mixture thereof may be used in theinsulating layer, and a stacked body of a plurality of layers thatinclude these substances can be also used for the insulating layer.

(Spacing Layer)

The spacing layer is a layer provided between a fluorescent emittinglayer and a phosphorescent emitting layer when the fluorescent emittinglayer and the phosphorescent emitting layer are stacked, in order toprevent diffusion of excitons generated in the phosphorescent emittinglayer to the fluorescent emitting layer or in order to adjust thecarrier balance. Further, the spacing layer can be provided betweenplural phosphorescent emitting layers.

Since the spacing layer is provided between the emitting layers, thematerial used for the spacing layer is preferably a substance that hasboth electron-transporting property and hole-transporting property. Inorder to prevent diffusion of the triplet energy in adjacentphosphorescent emitting layers, it is preferred that the material usedfor the spacing layer have a triplet energy of 2.6 eV or more.

As the material used for the spacing layer, the same materials as thoseused in the above-mentioned hole-transporting layer can be given.

(Electron-Blocking Layer, Hole-Blocking Layer, Exciton-Blocking Layer)

An electron-blocking layer, a hole-blocking layer, an exciton(triplet)-blocking layer, and the like may be provided in adjacent tothe emitting layer.

The electron-blocking layer has a function of preventing leakage ofelectrons from the emitting layer to the hole-transporting layer. Thehole-blocking layer has a function of preventing leakage of holes fromthe emitting layer to the electron-transporting layer. Theexciton-blocking layer has a function of preventing diffusion ofexcitons generated in the emitting layer to the adjacent layers toconfine the excitons within the emitting layer.

(Intermediate Layer)

In tandem-type organic EL device, an intermediate layer is provided.

(Method for Forming a Layer)

The method for forming each layer of the organic EL device is notparticularly limited unless otherwise specified. As the film formingmethod, a known film-forming method such as a dry film-forming method, awet film-forming method or the like can be used. Specific examples ofthe dry film-forming method include a vacuum deposition method, asputtering method, a plasma method, an ion plating method, and the like.Specific examples of the wet film-forming method include various coatingmethods such as a spin coating method, a dipping method, a flow coatingmethod, and an inkjet method.

(Film Thickness)

The film thickness of each layer of the organic EL device is notparticularly limited unless otherwise specified. If the film thicknessis too small, defects such as pinholes are likely to occur to make itdifficult to obtain an enough luminance. On the other hand, if the filmthickness is too large, a high driving voltage is required to beapplied, leading to a lowering in efficiency. In this respect, the filmthickness is preferably 1 nm to 10 μm, and more preferably 1 nm to 0.2μm.

[Electronic Apparatus]

The electronic apparatus according to one aspect of the inventionincludes the above-described organic EL device according to one aspectof the invention. Examples of the electronic apparatus include displayparts such as an organic EL panel module; display devices of televisionsets, mobile phones, smart phones, personal computers, and the like; andemitting devices of a lighting device and a vehicle lighting device.

EXAMPLES

Next, the invention will be described in more detail by referring toExamples and Comparative Examples, but the invention is not limited inany way to the description of these Examples.

<Compounds>

The compounds represented by the formula (1) having a deuterium atom(host materials), which were used for fabrication of the organic ELdevices of Examples 1 to 19 are as follows:

The compounds having no deuterium atom (host materials), which were usedfor fabrication of the organic EL devices of Examples 1 to 19 andComparative Examples 1 to 12 are as follows:

The dopant materials used for fabrication of the organic EL devices ofExamples 1 to 19 and Comparative Examples 1 to 12 are shown below

Other compounds used for fabrication of the organic EL devices ofExamples 1 to 19 and Comparative Examples 1 to 12 are shown below

<Fabrication 1 of Organic EL Device>

An organic EL device was fabricated and evaluated as follows.

Example 1

A 25 mm×75 mm×1.1 mm-thick glass substrate with an ITO transparentelectrode (anode) (manufactured by GEOMATEC Co., Ltd.) was subjected toultrasonic cleaning in isopropyl alcohol for 5 minutes, and thensubjected to UV-ozone cleaning for 30 minutes. The thickness of the ITOfilm was 130 nm.

The glass substrate with the transparent electrode after being cleanedwas mounted onto a substrate holder in a vacuum vapor depositionapparatus. First, a compound HI was deposited on a surface on the sideon which the transparent electrode was formed so as to cover thetransparent electrode to forma compound HI film having a thickness of 5nm. This HI film functions as a hole-injecting layer.

Following the formation of the HI film, a compound HT was deposited toform a HT film having a thickness of 80 nm on the HI film. The HT filmfunctions as a first hole-transporting layer.

Following the formation of the HT film, a compound EBL was deposited toform an EBL film having a thickness of 10 nm on the HT film. The EBLfilm functions as a second hole-transporting layer.

BH-1 (second host material) D-BH-1 (first host material), and BD-1(dopant material) were co-deposited on the EBL film to be 29:67:4% inthe proportion (% by mass) of BH-1:D-BH-1:BD-1 to form an emitting layerhaving a thickness of 25 nm.

HBL was deposited on the emitting layer to form an electron-transportinglayer having a thickness of 10 nm. ET as an electron-injecting materialwas deposited on the electron-transporting layer to form anelectron-injecting layer having a thickness of 15 nm. LiF was depositedon the electron-injecting layer to forma LiF film having a thickness of1 nm. Metal Al was deposited on the LiF film to form a metal cathodehaving a thickness of 80 nm. As described above, an organic EL devicewas fabricated. The layer configuration of the device is as follows. ITO(130 nm)/HI (5 nm)/HT (80 nm)/EBL (10 nm)/BH-1:D-BH-1:BD-1 (25 nm: 29,67, 4%)/HBL (10 nm)/ET (15 nm)/LiF (1 nm)/Al (80 nm)

In parentheses, the numerical values in percentage indicate theproportions (% by mass) of the respective materials in the emittinglayer.

(Evaluation 1 of Organic EL Device)

A voltage was applied to the obtained organic EL device so that thecurrent density became 50 mA/cm², and the time until the luminancebecame 90% of the initial luminance (LT90 (unit: hours)) was measured.The results are shown in Table 1.

Comparative Examples 1 and 2

The organic EL devices were fabricated and evaluated in the same manneras in Example 1 except that the compounds shown in Table 1 were used asthe host materials of the emitting layer. The results are shown in Table1.

TABLE 1 Proportion of First Second D-BH-1 in the host host Dopantemitting layer LT90 material material material (% by mass) (h) Example 1D-BH-1 BH-1 BD-1 70 372 Comparative — BH-1 BD-1  0 291 Example 1Comparative D-BH-1 — BD-1 100  372 Example 2

From the results shown in Table 1, it can be seen that Example 1 andComparative Example 2 using the host material having a deuterium atomgreatly increase the device lifetime as compared with ComparativeExample 1 using the host material having no deuterium atom.

Further, it can be seen that the device lifetime is equivalent betweenComparative Example 2 using only the host material having a deuteriumatom, and Example 1 using a first host material having a deuterium atomand a second host material having the same chemical structure as thefirst host material except having no deuterium atom are used incombination. In other words, it is possible to obtain an effect ofprolonging the lifetime while reducing the amount of the host materialhaving a deuterium atom by adopting a co-host configuration using twokinds of host materials having a deuterium atom and having no deuteriumatom rather than the configuration using the host material having adeuterium atom alone.

As a reason for prolonging the lifetime of Example 1, it is consideredthat, by using a host material having a deuterium atom, deteriorate ofthe host material accompanying recombine of holes and electrons issuppressed.

Example 2 and Comparative Example 3

The organic EL devices were fabricated and evaluated in the same manneras in Example 1 except that the compounds shown in Table 2 were used asthe first host material and the second host material of the emittinglayer. The results are shown in Table 2.

TABLE 2 Proportion of First Second D-BH-1 in the host host Dopantemitting layer LT90 material material material (% by mass) (h) Example 2D-BH-2 BH-2 BD-1 70 336 Comparative Example 3 BH-2 — BD-1  0 299

From the results shown in Table 2, it can be seen that the devicelifetime is increased by using the first host material having adeuterium atom and the second host material having no deuterium atom incombination.

<Fabrication 2 of Organic EL Device>

Example 3

A 25 mm×75 mm×1.1 mm-thick glass substrate with an ITO transparentelectrode (anode) (manufactured by GEOMATEC Co., Ltd.) was subjected toultrasonic cleaning in isopropyl alcohol for 5 minutes, and thensubjected to UV-ozone cleaning for 30 minutes. The thickness of the ITOfilm was 130 nm.

The glass substrate with the transparent electrode after being cleanedwas mounted onto a substrate holder in a vacuum vapor depositionapparatus. First, a compound HI was deposited on a surface on the sideon which the transparent electrode was formed so as to cover thetransparent electrode to forma compound HI film having a thickness of 5nm. This HI film functions as a hole-injecting layer.

Following the formation of the HI film, a compound HT was deposited toform a HT film having a thickness of 80 nm on the HI film. The HT filmfunctions as a first hole-transporting layer.

Following the formation of the HT film, a compound EBL-2 was depositedto form a EBL-2 film having a thickness of 10 nm on the HT film. TheEBL-2 film functions as a second hole-transporting layer.

BH-2 (second host material), D-BH-2 (first host material), and BD-1(dopant material) were co-deposited on the EBL-2 film to be 56:40:4% inthe proportion (% by mass) of BH-2:D-BH-2:BD-1 to form an emitting layerhaving a thickness of 25 nm.

HBL-2 was deposited on this emitting layer to form anelectron-transporting layer having a thickness of 10 nm. ET of anelectron-injecting material was deposited on the electron-transportinglayer to form an electron-injecting layer having a thickness of 15 nm.LiF was deposited on the electron-injecting layer to form a LiF filmhaving a thickness of 1 nm. Metal Al was deposited on the LiF film toform a metal cathode having a thickness of 80 nm.

As described above, an organic EL device was fabricated. The layerconfiguration of the device is as follows.

ITO (130 nm)/HI (5 nm)/HT (80 nm)/EBL-2 (10 nm)/BH-2:D-BH-2:BD-1 (25 nm:56, 40, 4%)/HBL-2 (10 nm)/ET (15 nm)/LiF (1 nm)/Al (80 nm)

In parentheses, the numerical values in percentage indicate theproportion (% by mass) of the first compound, the second compound, andthe third compound in the layer.

Examples 4 to 8, and Comparative Examples 4 and 5

The organic EL devices were fabricated in the same manner as in Example3 except that the compounds shown in Table 3 were used as the hostmaterial of the emitting layer and the proportion (% by mass) of thefirst host material in the emitting layer was changed as shown in Table3.

(Evaluation 2 of Organic EL Device)

A voltage was applied to the obtained organic EL device so that thecurrent density became 50 mA/cm², and the time until the luminancebecame 90% of the initial luminance (LT90 (unit: hours)) was measured.The relative values of LT90 of Examples and Comparative Examples areshown in Table 3, with the value of LT90 of the device of ComparativeExample 4, which has a single emitting layer containing a host materialhaving no deuterium atom, as 1.

TABLE 3 Proportion First Second of the first Relative host host Dopanthost material value materal material material (% by mass) LT90 Example 3D-BH-2 BH-2 BD-1 40 1.07 Example 4 D-BH-2 BH-2 BD-1 50 1.07 Example 5D-BH-2 BH-2 BD-1 60 1.07 Example 6 D-BH-2 BH-2 BD-1 70 1.25 Example 7D-BH-2 BH-2 BD-1 80 1.25 Example 8 D-BH-2 BH-2 BD-1 90 1.25 Comparative— BH-2 BD-1  0 1.00 Example 4 Comparative D-BH-2 — BD-1 100  1.25Example 5

From the results shown in Table 3, it can be seen that the devices ofExamples 3 to 8 in which the emitting layer containing the first hostmaterial D-BH-2 having a deuterium atom and the second host materialBH-2 having no deuterium atom are stacked have increased lifetimecompared with the device of Comparative Example 4 in which the emittinglayer containing only the host material BH-2 having no deuterium atom isprovided.

In addition, it can be seen that the devices of Examples 6 to 8 have alifetime equivalent to that of the device of Comparative Example 5having an emitting layer containing only the host material D-BH-2 havinga deuterium atom.

Example 9

The organic EL devices were fabricated and evaluated in the same manneras in Example 3 except that the compounds shown in Table 4 were used asthe host material of the emitting layer and the proportion (% by mass)of the first host material in the emitting layer was changed as shown inTable 4. The results are shown in Table 4.

The layer configuration of the device fabricated as described above isas follows.

ITO (130 nm)/HI (5 nm)/HT (80 nm)/EBL-2 (10 nm)/BH-2:D-BH-2:BD-2 (25nm:26, 70, 2%)/HBL-2 (10 nm)/ET (15 nm)/LiF (1 nm)/Al (80 nm)

Examples 10 and 11, and Comparative Example 6

The organic EL devices were fabricated and evaluated in the same manneras in Example 9 except that the proportion (% by mass) of the first hostmaterial in the emitting layer was changed as shown in Table 4. Theresults are shown in Table 4.

TABLE 4 Proportion First Second of the first Relative host host Dopanthost material value materal material material (% by mass) LT90 Example 9D-BH-2 BH-2 BD-2 70 1.15 Example 10 D-BH-2 BH-2 BD-2 80 1.15 Example 11D-BH-2 BH-2 BD-2 90 1.15 Comparative — BH-2 BD-2  0 1.00 Example 6

From the results shown in Table 4, it can be seen that the devices ofExamples 9 to 11 in which the emitting layer containing the first hostmaterial D-BH-2 having a deuterium atom and the second host materialBH-2 having no deuterium atom are stacked have increased lifetimecompared with the device of Comparative Example 6 in which the emittinglayer containing only the host material BH-2 having no deuterium atom isprovided.

Example 12

The organic EL devices were fabricated and evaluated in the same manneras in Example 3 except that the compounds shown in Table 5 were used asthe host materials of the emitting layer and the proportion (% by mass)of the first host material in the emitting layer was changed as shown inTable 5. The results are shown in Table 5.

The layer configuration of the device fabricated as described above isas follows.

ITO (130 nm)/HI (5 nm)/HT (80 nm)/EBL-2 (10 nm)/BH-1:D-BH-1:BD-3 (25 nm:28, 70, 2%)/HBL-2 (10 nm)/ET (15 nm)/LiF (1 nm)/Al (80 nm)

Examples 13 and 14, and Comparative Example 7

The organic EL devices were fabricated and evaluated in the same manneras in Example 12 except that the proportion (% by mass) of the firsthost material in the emitting layer was changed as shown in Table 5. Theresults are shown in Table 5.

Table 5

TABLE 5 Proportion First Second of the first Relative host host Dopanthost material value materal material material (% by mass) LT90 Example12 D-BH-1 BH-1 BD-3 70 1.06 Example 13 D-BH-1 BH-1 BD-3 80 1.06 Example14 D-BH-1 BH-1 BD-3 90 1.06 Comparative — BH-1 BD-3  0 1.00 Example 7

From the results shown in Table 5, it can be seen that the devices ofExamples 12 to 14 in which the emitting layer containing the first hostmaterial D-BH-1 having a deuterium atom and the second host materialBH-1 having no deuterium atom are stacked have increased lifetimecompared with the device of Comparative Example 7 in which the emittinglayer containing only the host material BH-1 having no deuterium atom isprovided.

Example 15

The organic EL device was fabricated and evaluated in the same manner asin Example 3 except that the compounds shown in Table 6 were used as thehost material and the dopant material of the emitting layer and theproportion (% by mass) of the first host material in the emitting layerwas changed as shown in Table 6. The results are shown in Table 6.

The layer configuration of the device fabricated as described above isas follows.

ITO (130 nm)/HI (5 nm)/HT (80 nm)/EBL-2 (10 nm)/BH-2:D-BH-1:BD-1 (25 nm:26, 70, 4%)/HBL-2 (10 nm)/ET (15 nm)/LiF (1 nm)/Al (80 nm)

Comparative Example 8

The organic EL device was fabricated and evaluated in the same manner asin Example 15 except that the proportion (% by mass) of the first hostmaterial in the emitting layer was changed as shown in Table 6. Theresults are shown in Table 6.

TABLE 6 Proportion First Second of the first Relative host host Dopanthost material value materal material material (% by mass) LT90 Example15 D-BH-1 BH-2 BD-1 70 1.05 Comparative BH-1 BH-2 BD-1 70 1.00 Example 8

From the results shown in Table 6, it can be seen that the device ofExample 15 in which the emitting layer containing the first hostmaterial D-BH-1 having a deuterium atom and the second host materialBH-2 having no deuterium atom are stacked has increased lifetimecompared with the device of Comparative Example 8 in which the emittinglayer containing the host material BH-1 and BH-2 having no deuteriumatom is provided.

Example 16

The organic EL device was fabricated and evaluated in the same manner asin Example 3 except that the compounds shown in Table 7 were used as thehost material and the dopant material of the emitting layer and theproportion (% by mass) of the first host material in the emitting layerwas changed as shown in Table 7. The results are shown in Table 7.

The layer configuration of the device fabricated as described above isas follows.

ITO (130 nm)/HI (5 nm)/HT (80 nm)/EBL-2 (10 nm)/BH-1:D-BH-2:BD-1 (25 nm:26, 70, 4%)/HBL-2 (10 nm)/ET (15 nm)/LiF (1 nm)/Al (80 nm)

Comparative Example 9

The organic EL device was fabricated and evaluated in the same manner asin Example 16 except that the proportion (% by mass) of the first hostmaterial in the emitting layer was changed as shown in Table 7. Theresults are shown in Table 7.

TABLE 7 Proportion First Second of the first Relative host host Dopanthost material value materal material material (% by mass) LT90 Example16 D-BH-2 BH-1 BD-1 70 1.18 Comparative BH-2 BH-1 BD-1 70 1.00 Example 9

From the results shown in Table 7, it can be seen that the device ofExample 16 in which the emitting layer containing the first hostmaterial D-BH-2 having a deuterium atom and the second host materialBH-1 having no deuterium atom are stacked has increased lifetimecompared with the device of Comparative Example 9 in which the emittinglayer containing the host material BH-1 and BH-2 having no deuteriumatom is provided.

Example 17

The organic EL device was fabricated and evaluated in the same manner asin Example 3 except that the compounds shown in Table 8 were used as thehost material and the dopant material of the emitting layer and theproportion (% by mass) of the first host material in the emitting layerwas changed as shown in Table 8. The results are shown in Table 8.

The layer configuration of the device fabricated as described above isas follows.

ITO (130 nm)/HI (5 nm)/HT (80 nm)/EBL-2 (10 nm)/BH-4:D-BH-4:BD-1 (25 nm:26, 70, 4%)/HBL-2 (10 nm)/ET (15 nm)/LiF (1 nm)/Al (80 nm)

Comparative Example 10

The organic EL device was fabricated and evaluated in the same manner asin Example 17 except that the proportion (% by mass) of the first hostmaterial in the emitting layer was changed as shown in Table 8. Theresults are shown in Table 8.

TABLE 8 Proportion First Second of the first Relative host host Dopanthost material value materal material material (% by mass) LT90 Example17 D-BH-4 BH-4 BD-1 70 1.30 Comparative — BH-4 BD-1  0 1.00 Example 10

From the results shown in Table 8, it can be seen that the device ofExample 17 in which the emitting layer containing the first hostmaterial D-BH-4 having a deuterium atom and the second host materialBH-4 having no deuterium atom are stacked has increased lifetimecompared with the device of Comparative Example 10 in which the emittinglayer containing only the host material BH-4 having no deuterium atom isprovided.

Example 18

The organic EL device was fabricated and evaluated in the same manner asin Example 3 except that the compounds shown in Table 9 were used as thehost material and the dopant material of the emitting layer and theproportion (% by mass) of the first host material in the emitting layerwas changed as shown in Table 9. The results are shown in Table 9.

The layer configuration of the device fabricated as described above isas follows.

ITO (130 nm)/HI (5 nm)/HT (80 nm)/EBL-2 (10 nm)/BH-2:D-BH-4:BD-1 (25 nm:26, 70, 4%)/HBL-2 (10 nm)/ET (15 nm)/LiF (1 nm)/Al (80 nm)

Comparative Example 11

The organic EL device was fabricated and evaluated in the same manner asin Example 18 except that the proportion (% by mass) of the first hostmaterial in the emitting layer was changed as shown in Table 9. Theresults are shown in Table 9.

TABLE 9 Proportion First Second of the first Relative host host Dopanthost material value materal material material (% by mass) LT90 Example18 D-BH-4 BH-2 BD-1 70 1.27 Comparative BH-4 BH-2 BD-1 70 1.00 Example11

From the results shown in Table 9, it can be seen that the device ofExample 18 in which the emitting layer containing the first hostmaterial D-BH-4 having a deuterium atom and the second host materialBH-2 having no deuterium atom are stacked has increased lifetimecompared with the device of Comparative Example 11 in which the emittinglayer containing the host materials BH-4 and BH-2 having no deuteriumatom is provided.

Example 19

The organic EL device was fabricated and evaluated in the same manner asin Example 3 except that the compounds shown in Table 10 were used asthe host material and the dopant material of the emitting layer and theproportion (% by mass) of the first host material in the emitting layerwas changed as shown in Table 10. The results are shown in Table 10.

The layer configuration of the device fabricated as described above isas follows.

ITO (130 nm)/HI (5 nm)/HT (80 nm)/EBL-2 (10 nm)/BH-4:D-BH-2:BD-1 (25 nm:26, 70, 4%)/HBL-2 (10 nm)/ET (15 nm)/LiF (1 nm)/Al (80 nm)

Comparative Example 12

The organic EL device was fabricated and evaluated in the same manner asin Example 19 except that the proportion (% by mass) of the first hostmaterial in the emitting layer was changed as shown in Table 10. Theresults are shown in Table 10.

TABLE 10 Proportion First Second of the first Relative host host Dopanthost material value materal material material (% by mass) LT90 Example19 D-BH-2 BH-4 BD-1 70 1.16 Comparative BH-2 BH-4 BD-1 70 1.00 Example12

From the results shown in Table 10, it can be seen that the device ofExample 19 in which the emitting layer containing the first hostmaterial D-BH-2 having a deuterium atom and the second host materialBH-4 having no deuterium atom are stacked has increased lifetimecompared with the device of Comparative Example 12 in which the emittinglayer containing the host materials BH-2 and BH-4 having no deuteriumatom is provided.

Although only some exemplary embodiments and/or examples of thisinvention have been described in detail above, those skilled in the artwill readily appreciate that many modifications are possible in theexemplary embodiments and/or examples without materially departing fromthe novel teachings and advantages of this invention. Accordingly, allsuch modifications are intended to be included within the scope of thisinvention.

The invention claimed is:
 1. An organic electroluminescence devicecomprising: an anode, a cathode, and a first fluorescent emitting layerbetween the cathode and the anode, wherein the first fluorescentemitting layer comprises a first host material, a second host material,and a fluorescent dopant material, the first host material is a compoundrepresented by the following formula (1) having at least one deuteriumatom, and the second host material is a compound represented by thefollowing formula (1′):

wherein in the formula (1), R₁ to R₈ are independently a hydrogen atom,an unsubstituted alkyl group including 1 to 50 carbon atoms, anunsubstituted alkenyl group including 2 to 50 carbon atoms, anunsubstituted alkynyl group including 2 to 50 carbon atoms, anunsubstituted cycloalkyl group including 3 to 50 ring carbon atoms,—Si(R₉₀₁)(R₉₀₂)(R₉₀₃), —O—(R₉₀₄), —S—(R₉₀₅), —N(R₉₀₆)(R₉₀₇), a halogenatom, a cyano group, a nitro group, an unsubstituted aryl groupincluding 6 to 50 ring carbon atoms, or an unsubstituted monovalentheterocyclic group including 5 to 50 ring atoms, R₉₀₁ to R₉₀₇ areindependently a hydrogen atom, an unsubstituted alkyl group including 1to 50 carbon atoms, an unsubstituted cycloalkyl group including 3 to 50ring carbon atoms, an unsubstituted aryl group including 6 to 50 ringcarbon atoms, or an unsubstituted monovalent heterocyclic groupincluding 5 to 50 ring atoms, when two or more of each of R₉₀₁ to R₉₀₇are present, the two or more of each of R₉₀₁ to R₉₀₇ are the same as ordifferent from each other, adjacent two or more of R₁ to R₄, andadjacent two or more of R₅ to R₈ do not form a ring by bonding with eachother, L₁ and L₂ are independently a single bond, an unsubstitutedarylene group including 6 to 30 ring carbon atoms, or an unsubstituteddivalent heterocyclic group including 5 to 30 ring atoms, Ar₁ and Ar₂are independently an unsubstituted phenyl group, an unsubstitutedbiphenyl group, an unsubstituted naphthyl group, or an unsubstituteddibenzofuranyl group, and at least one hydrogen atom selected from thefollowing is a deuterium atom: hydrogen atoms of R₁ to R₈ in the casewhere they are hydrogen atoms, and hydrogen atoms possessed by one ormore groups selected from R₁ to R₈ which are not hydrogen atoms, L₁which is not a single bond, L₂ which is not a single bond, and Ar₁ andAr₂; and

wherein in the formula (1′), R₁ to R₈ are independently a hydrogen atom,an unsubstituted alkyl group including 1 to 50 carbon atoms, anunsubstituted alkenyl group including 2 to 50 carbon atoms, anunsubstituted alkynyl group including 2 to 50 carbon atoms, anunsubstituted cycloalkyl group including 3 to 50 ring carbon atoms,—Si(R₉₀₁)(R₉₀₂)(R₉₀₃), —O—(R₉₀₄), —S—(R₉₀₅), —N(R₉₀₆)(R₉₀₇), a halogenatom, a cyano group, a nitro group, an unsubstituted aryl groupincluding 6 to 50 ring carbon atoms, or an unsubstituted monovalentheterocyclic group including 5 to 50 ring atoms, R₉₀₁ to R₉₀₇ areindependently a hydrogen atom, an unsubstituted alkyl group including 1to 50 carbon atoms, an unsubstituted cycloalkyl group including 3 to 50ring carbon atoms, an unsubstituted aryl group including 6 to 50 ringcarbon atoms, or an unsubstituted monovalent heterocyclic groupincluding 5 to 50 ring atoms; when two or more of each of R₉₀₁ to R₉₀₇are present, the two or more of each of R₉₀₁ to R₉₀₇ are the same as ordifferent from each other; adjacent two or more of R₁ to R₄, andadjacent two or more of R₅ to R₈ do not form a ring by bonding with eachother; L₁ and L₂ are independently a single bond, an unsubstitutedarylene group including 6 to 30 ring carbon atoms, or an unsubstituteddivalent heterocyclic group including 5 to 30 ring atoms; Ar₁ and Ar₂are independently an unsubstituted phenyl group, an unsubstitutedbiphenyl group, an unsubstituted naphthyl group, or an unsubstituteddibenzofuranyl group, wherein the second host material is a compoundthat does not substantially comprise a deuterium atom, -L₁-Ar₁ in thefirst host material represented by the formula (1) has the same chemicalstructure as -L₁-Ar₁ in the second host material represented by theformula (1′) except that when -L₁-Ar₁ in the first host materialcomprises at least one deuterium atom, each of such at least onedeuterium atom in -L₁-Ar₁ of the first host material is replaced by aprotium atom in -L₁-Ar₁ of the second host material, and the chemicalstructure when all of the deuterium atoms of the first host material isreplaced with protium atom is different from the chemical structure ofthe second host material.
 2. The organic electroluminescence deviceaccording to claim 1, wherein the first host material is a compoundrepresented by the formula (1) having at least one deuterium atom bondedwith a carbon atom on the anthracene skeleton.
 3. The organicelectroluminescence device according to claim 1, wherein the first hostmaterial is a compound represented by the formula (1) having at leastone deuterium atom bonded with a carbon atom other than carbon atoms onthe anthracene skeleton.
 4. The organic electroluminescence deviceaccording to claim 1, further comprising a second emitting layerdifferent from the first fluorescent emitting layer, the second emittinglayer is between the first fluorescent emitting layer and the cathode orbetween the first fluorescent emitting layer and the anode.
 5. Theorganic electroluminescence device according to claim 4, wherein thefirst fluorescent emitting layer and the second emitting layer aredirectly adjacent to each other.
 6. The organic electroluminescencedevice according to claim 1, wherein in the formulas (1) and (1′), eachL₁ is a single bond, and each Ar₁ is an unsubstituted phenyl group, anunsubstituted biphenyl group, or an unsubstituted naphthyl group.
 7. Theorganic electroluminescence device according to claim 1, wherein in theformulas (1) and (1′), each L₁ is a single bond, and each Ar₁ is anunsubstituted phenyl group, an unsubstituted biphenyl group, or anunsubstituted naphthyl group, and R₂ is an unsubstituted aryl group. 8.The organic electroluminescence device according to claim 2, wherein inthe formulas (1) and (1′), each L₁ is an unsubstituted phenylene groupor an unsubstituted naphthylene group, and each Ar₁ is an unsubstitutedphenyl group or an unsubstituted naphthyl group.
 9. The organicelectroluminescence device according to claim 1, wherein in formulas (1)and (1′), each L₁ is an unsubstituted phenylene group or anunsubstituted naphthylene group, each Ar₁ is an unsubstituted phenylgroup or an unsubstituted naphthyl group, and R₂ is an unsubstitutedaryl group.
 10. The organic electroluminescence device according toclaim 1, wherein the mass ratio of the first host material representedby the formula (1) having at least one deuterium atom and the secondhost material represented by the formula (1′) having no deuterium atomis in the range of 15:85 to 85:15.
 11. The organic electroluminescencedevice according to claim 1, wherein in the formula (1), all of thefollowing hydrogen atoms are deuterium atoms: hydrogen atoms of R₁ to R₈in the case where they are hydrogen atoms, and hydrogen atoms possessedby the groups of R₁ to R₈ which are not hydrogen atoms, L₁ which is nota single bond, L₂ which is not a single bond, and Ar₁ and Ar₂.
 12. Theorganic electroluminescence device according to claim 1, wherein thefirst host material represented by the formula (1) and the second hostmaterial represented by the formula (1′) are independently a compoundhaving a skeleton selected from the following skeletons:


13. The organic electroluminescence device according to claim 1, whereinthe first host material is one or more compounds selected from the groupconsisting of:

wherein “D” represents a deuterium atom, and the second host material isone or more compounds selected from the group consisting of:


14. The organic electroluminescence device according to claim 1, whereinthe dopant material is selected from the group consisting of compoundsrepresented by each of the following formulas (11), (21), (31), (41),(51), (61), (71), (81), and (91):

wherein in the formula (11), one or more sets of adjacent two or more ofR₁₀₁ to R₁₁₀ form an unsubstituted, saturated or unsaturated ring bybonding with each other, or do not form an unsubstituted, saturated orunsaturated ring, at least one of R₁₀₁ to R₁₁₀ is a monovalent grouprepresented by the following formula (12), R₁₀₁ to R₁₁₀ which do notform an unsubstituted, saturated or unsaturated ring, and are not amonovalent group represented by the following formula (12) areindependently a hydrogen atom, an unsubstituted alkyl group including 1to 50 carbon atoms, an unsubstituted alkenyl group including 2 to 50carbon atoms, an unsubstituted alkynyl group including 2 to 50 carbonatoms, an unsubstituted cycloalkyl group including 3 to 50 ring carbonatoms, —Si(R₉₀₁)(R₉₀₂)(R₉₀₃), —O—(R₉₀₄), —S—(R₉₀₅), —N(R₉₀₆)(R₉₀₇), ahalogen atom, a cyano group, a nitro group, an unsubstituted aryl groupincluding 6 to 50 ring carbon atoms, or an unsubstituted monovalentheterocyclic group including 5 to 50 ring atoms, R₉₀₁ to R₉₀₇ are asdefined in the formula (1),

wherein in the formula (12), Ar101 and Ar102 are independently anunsubstituted aryl group including 6 to 50 ring carbon atoms, or anunsubstituted monovalent heterocyclic group including 5 to 50 ringatoms, and L₁₀₁ to L₁₀₃ are independently a single bond, anunsubstituted arylene group including 6 to 30 ring carbon atoms, or anunsubstituted divalent heterocyclic group including 5 to 30 ring atoms;

wherein in the formula (21), Z's are independently CRa or N, ring A1 andring A2 are independently an unsubstituted aromatic hydrocarbon ringincluding 6 to 50 ring carbon atoms, or an unsubstituted heterocyclicring including 5 to 50 ring atoms, when a plurality of R_(a)'s arepresent, one or more sets of adjacent two or more of the plurality ofR_(a)'s form an unsubstituted, saturated or unsaturated ring by bondingwith each other, or do not form an unsubstituted, saturated orunsaturated ring, when a plurality of R_(b)'s are present, one or moresets of adjacent two or more of the plurality of R_(b)'s form anunsubstituted, saturated or unsaturated ring by bonding with each other,or do not form an unsubstituted, saturated or unsaturated ring, when aplurality of R_(c)'s are present, one or more sets of adjacent two ormore of the plurality of R_(c)'s form an unsubstituted, saturated orunsaturated ring by bonding with each other, or do not form anunsubstituted, saturated or unsaturated ring, n21 and n22 areindependently an integer of 0 to 4, R_(a) to R_(c) which do not form theunsubstituted, saturated or unsaturated ring are independently ahydrogen atom, an unsubstituted alkyl group including 1 to 50 carbonatoms, an unsubstituted alkenyl group including 2 to 50 carbon atoms, anunsubstituted alkynyl group including 2 to 50 carbon atoms, anunsubstituted cycloalkyl group including 3 to 50 ring carbon atoms,—Si(R₉₀₁)(R₉₀₂)(R₉₀₃), —O—(R₉₀₄), —S—(R₉₀₅), —N(R₉₀₆)(R₉₀₇), a halogenatom, a cyano group, a nitro group, an unsubstituted aryl groupincluding 6 to 50 ring carbon atoms, or an unsubstituted monovalentheterocyclic group including 5 to 50 ring atoms, and R₉₀₁ to R₉₀₇ are asdefined in the formula (1);

wherein in the formula (31), one or more sets of adjacent two or more ofR₃₀₁ to R₃₀₇ and R₃₁₁ to R₃₁₇ form an unsubstituted, saturated orunsaturated ring, or do not form an unsubstituted, saturated orunsaturated ring, R₃₀₁ to R₃₀₇ and R₃₁₁ to R₃₁₇ which do not form theunsubstituted, saturated or unsaturated ring are independently ahydrogen atom, an unsubstituted alkyl group including 1 to 50 carbonatoms, an unsubstituted alkenyl group including 2 to 50 carbon atoms, anunsubstituted alkynyl group including 2 to 50 carbon atoms, anunsubstituted cycloalkyl group including 3 to 50 ring carbon atoms,—Si(R₉₀₁)(R₉₀₂)(R₉₀₃), —O—(R₉₀₄), —S—(R₉₀₅), —N(R₉₀₆)(R₉₀₇), a halogenatom, a cyano group, a nitro group, an unsubstituted aryl groupincluding 6 to 50 ring carbon atoms, or an unsubstituted monovalentheterocyclic group including 5 to 50 ring atoms, R₃₂₁ and R₃₂₂ areindependently a hydrogen atom, an unsubstituted alkyl group including 1to 50 carbon atoms, an unsubstituted alkenyl group including 2 to 50carbon atoms, an unsubstituted alkynyl group including 2 to 50 carbonatoms, an unsubstituted cycloalkyl group including 3 to 50 ring carbonatoms, —Si(R₉₀₁)(R₉₀₂)(R₉₀₃), —O—(R₉₀₄), —S—(R₉₀₅), —N(R₉₀₆)(R₉₀₇), ahalogen atom, a cyano group, a nitro group, an unsubstituted aryl groupincluding 6 to 50 ring carbon atoms, or an unsubstituted monovalentheterocyclic group including 5 to 50 ring atoms, and R₉₀₁ to R₉₀₇ are asdefined in the formula (1);

wherein in the formula (41), ring a, ring b and ring c are independentlyan unsubstituted aromatic hydrocarbon ring including 6 to 50 ring carbonatoms, or an unsubstituted heterocyclic ring including 5 to 50 ringatoms, R₄₀₁ and R₄₀₂ independently form an unsubstituted heterocyclicring by bonding with the ring a, the ring b, or the ring c, or do notform an unsubstituted heterocyclic ring, and R₄₀₁ and R₄₀₂ which do notform the unsubstituted heterocyclic ring are independently anunsubstituted alkyl group including 1 to 50 carbon atoms, anunsubstituted alkenyl group including 2 to 50 carbon atoms, anunsubstituted alkynyl group including 2 to 50 carbon atoms, anunsubstituted cycloalkyl group including 3 to 50 ring carbon atoms, anunsubstituted aryl group including 6 to 50 ring carbon atoms, or anunsubstituted monovalent heterocyclic group including 5 to 50 ringatoms;

wherein in the formula (51), a ring r is a ring represented by theformula (52) or formula (53) which is fused with an adjacent ring at anarbitrary position, a ring q and a ring s are independently a ringrepresented by the formula (54) which is fused with an adjacent ring atan arbitrary position, a ring p and a ring t are independently astructure represented by the formula (55) or the formula (56) which isfused with an adjacent ring at an arbitrary position, when a pluralityof R₅₀₁'s are present, the plurality of adjacent R₅₀₁'s form anunsubstituted, saturated or unsaturated ring by bonding with each other,or do not form an unsubstituted saturated or unsaturated ring, X₅₀₁ isan oxygen atom, a sulfur atom, or NR₅₀₂, R₅₀₁ and R₅₀₂ which do not formthe unsubstituted, saturated or unsaturated ring are independently ahydrogen atom, an unsubstituted alkyl group including 1 to 50 carbonatoms, an unsubstituted alkenyl group including 2 to 50 carbon atoms, anunsubstituted alkynyl group including 2 to 50 carbon atoms, anunsubstituted cycloalkyl group including 3 to 50 ring carbon atoms,—Si(R₉₀₁)(R₉₀₂)(R₉₀₃), —O—(R₉₀₄), —S—(R₉₀₅), —N(R₉₀₆)(R₉₀₇), a halogenatom, a cyano group, a nitro group, an unsubstituted aryl groupincluding 6 to 50 ring carbon atoms, or an unsubstituted monovalentheterocyclic group including 5 to 50 ring atoms, R₉₀₁ to R₉₀₇ are asdefined in the formula (1), Ar₅₀₁ and Ar₅₀₂ are independently anunsubstituted alkyl group including 1 to 50 carbon atoms, anunsubstituted alkenyl group including 2 to 50 carbon atoms, anunsubstituted alkynyl group including 2 to 50 carbon atoms, anunsubstituted cycloalkyl group including 3 to 50 ring carbon atoms, anunsubstituted aryl group including 6 to 50 ring carbon atoms, or anunsubstituted monovalent heterocyclic group including 5 to 50 ringatoms, L₅₀₁ is an unsubstituted alkylene group including 1 to 50 carbonatoms, an unsubstituted alkenylene group including 2 to 50 carbon atoms,an unsubstituted alkynylene group including 2 to 50 carbon atoms, anunsubstituted cycloalkylene group including 3 to 50 ring carbon atoms,an unsubstituted arylene group including 6 to 50 ring carbon atoms, oran unsubstituted divalent heterocyclic group including 5 to 50 ringatoms, m1's are independently an integer of 0 to 2, m2's areindependently an integer of 0 to 4, m3's are independently an integer of0 to 3, m4's are independently an integer of 0 to 5, and when aplurality of R501's are present, the plurality of R501's may be the sameas or different from each other;

wherein in the formula (61), at least one set of R₆₀₁ and R₆₀₂, R₆₀₂ andR₆₀₃, and R₆₀₃ and R₆₀₄ forms a divalent group represented by thefollowing formula (62) by bonding with each other, at least one set ofR₆₀₅ and R₆₀₆, R₆₀₆ and R₆₀₇, and R₆₀₇ and R₆₀₈ forms a divalent grouprepresented by the following formula (63) by bonding with each other,

at least one of R₆₀₁ to R₆₀₄ which do not form a divalent grouprepresented by the formula (62), and R₆₁₁ to R₆₁₄ is a monovalent grouprepresented by the following formula (64), at least one of R₆₀₅ to R₆₀₈which do not form a divalent group represented by the formula (63), andR₆₂₁ to R₆₂₄ is a monovalent group represented by the following formula(64), X₆₀₁ is an oxygen atom, a sulfur atom, or NR₆₀₉, R₆₀₁ to R₆₀₈which do not form a divalent group represented by any of the formulas(62) and (63) and which are not a monovalent group represented by theformula (64), R₆₁₁ to R₆₁₄ and R₆₂₁ to R₆₂₄ which are not a monovalentgroup represented by the formula (64), and R₆₀₉ are independently ahydrogen atom, an unsubstituted alkyl group including 1 to 50 carbonatoms, an unsubstituted alkenyl group including 2 to 50 carbon atoms, anunsubstituted alkynyl group including 2 to 50 carbon atoms, anunsubstituted cycloalkyl group including 3 to 50 ring carbon atoms,—Si(R₉₀₁)(R₉₀₂)(R₉₀₃), —O—(R₉₀₄), —S—(R₉₀₅), —N(R₉₀₆)(R₉₀₇), a halogenatom, a cyano group, a nitro group, an unsubstituted aryl groupincluding 6 to 50 ring carbon atoms, or an unsubstituted monovalentheterocyclic group including 5 to 50 ring atoms, R₉₀₁ to R₉₀₇ are asdefined in the formula (1),

wherein in the formula (64), Ar₆₀₁ and Ar₆₀₂ are independently anunsubstituted aryl group including 6 to 50 ring carbon atoms, or anunsubstituted monovalent heterocyclic group including 5 to 50 ringatoms, and L₆₀₁ to L₆₀₃ are independently a single bond, anunsubstituted arylene group including 6 to 30 ring carbon atoms, anunsubstituted divalent heterocyclic group including 5 to 30 ring atoms,or a divalent linking group formed by bonding two to four of these;

wherein in the formula (71), a ring A₇₀₁ and a ring A₇₀₂ areindependently an unsubstituted aromatic hydrocarbon ring including 6 to50 ring carbon atoms, or an unsubstituted heterocyclic ring including 5to 50 ring atoms, one or more selected from the group consisting of thering A₇₀₁ and the ring A₇₀₂ are bonded with “*” in the structurerepresented by the following formula (72),

wherein in the formula (72), a ring A₇₀₃ is an unsubstituted aromatichydrocarbon ring including 6 to 50 ring carbon atoms, or anunsubstituted heterocyclic ring including 5 to 50 ring atoms, X₇₀₁ isNR₇₀₃, C(R₇₀₄)(R₇₀₅), Si(R₇₀₆)(R₇₀₇), Ge(R₇₀₈)(R₇₀₉), O, S, or Se, R₇₀₁and R₇₀₂ form an unsubstituted, saturated or unsaturated ring by bondingwith each other, or do not form an unsubstituted, saturated orunsaturated ring, R₇₀₁ and R₇₀₂ which do not form the unsubstituted,saturated or unsaturated ring, and R₇₀₃ to R₇₀₉ are independently ahydrogen atom, an unsubstituted alkyl group including 1 to 50 carbonatoms, an unsubstituted alkenyl group including 2 to 50 carbon atoms, anunsubstituted alkynyl group including 2 to 50 carbon atoms, anunsubstituted cycloalkyl group including 3 to 50 ring carbon atoms,—Si(R₉₀₁)(R₉₀₂)(R₉₀₃), —O—(R₉₀₄), —S—(R₉₀₅), —N(R₉₀₆)(R₉₀₇), a halogenatom, a cyano group, a nitro group, an unsubstituted aryl groupincluding 6 to 50 ring carbon atoms, or an unsubstituted monovalentheterocyclic group including 5 to 50 ring atoms, and R₉₀₁ to R₉₀₇ are asdefined in the formula (1);

wherein in the formula (81), a ring A₈₀₁ is a ring represented by theformula (82) which is fused with the adjacent ring at an arbitraryposition, a ring A₈₀₂ is a ring represented by the formula (83) which isfused with the adjacent ring at an arbitrary position, the two of “*”are bonded with the ring A₈₀₃ at arbitrary positions, X₈₀₁ and X₈₀₂ areindependently C(R₈₀₃)(R₈₀₄), Si(R₈₀₅)(R₈₀₆), an oxygen atom, a sulfuratom, the ring A₈₀₃ is an unsubstituted aromatic hydrocarbon ringincluding 6 to 50 ring carbon atoms or an unsubstituted heterocyclicring including 5 to 50 ring atoms, Ar₈₀₁ is an unsubstituted aryl groupincluding 6 to 50 ring carbon atoms, or an unsubstituted monovalentheterocyclic group including 5 to 50 ring atoms, R₈₀₁ to R₈₀₆ areindependently a hydrogen atom, an unsubstituted alkyl group including 1to 50 carbon atoms, an unsubstituted alkenyl group including 2 to 50carbon atoms, an unsubstituted alkynyl group including 2 to 50 carbonatoms, an unsubstituted cycloalkyl group including 3 to 50 ring carbonatoms, —Si(R₉₀₁)(R₉₀₂)(R₉₀₃), —O—(R₉₀₄), —S—(R₉₀₅), —N(R₉₀₆)(R₉₀₇), ahalogen atom, a cyano group, a nitro group, an unsubstituted aryl groupincluding 6 to 50 ring carbon atoms, or an unsubstituted monovalentheterocyclic group including 5 to 50 ring atoms, R₉₀₁ to R₉₀₇ are asdefined in the formula (1), m801 and m₈02 are independently an integerof 0 to 2, when m801 and m802 are 2, the plurality of each of R₈₀₁ orR₈₀₂ may be the same as or different from each other, a801 is an integerof 0 to 2, when a801 is 0 or 1, the structures in parentheses, whichexist in number indicated by “3-a801 (3 subtract a801)” may be the sameas or different from each other, and when a801 is 2, Ar801 may be thesame as or different from each other; and

wherein in the formula (91), any one or more sets selected from thegroup consisting of: one or more sets of adjacent two or more of R₉₅₁ toR₉₆₀, one or more sets of adjacent two or more of Ra1 to Ra5, and one ormore sets of adjacent two or more of Ra6 to Ra10 form an unsubstituted,saturated or unsaturated ring including 3 to 30 ring atoms, and R₉₅₁ toR₉₆₀, Ra1 to Ra5, and Ra6 to Ra10 which are not involved in ringformation are independently a hydrogen atom, an unsubstituted alkylgroup including 1 to 30 carbon atoms, an unsubstituted cycloalkyl groupincluding 3 to 30 ring carbon atoms, an unsubstituted alkoxy groupincluding 1 to 30 carbon atoms, an unsubstituted alkylthio groupincluding 1 to 30 carbon atoms, an unsubstituted amino group, anunsubstituted aryl group including 6 to 30 ring carbon atoms, anunsubstituted heterocyclic group including 5 to 30 ring atoms, anunsubstituted alkenyl group including 2 to 30 carbon atoms, anunsubstituted aryloxy group including 6 to 30 ring carbon atoms, anunsubstituted arylthio group including 6 to 30 ring carbon atoms, anunsubstituted phosphanyl group, an unsubstituted phosphoryl group, anunsubstituted silyl group, an unsubstituted arylcarbonyl group including6 to 30 ring carbon atoms, a cyano group, a nitro group, a carboxylgroup, or a halogen atom.
 15. The organic electroluminescence deviceaccording to claim 1, wherein the dopant material is selected from thegroup consisting of compounds represented by each of the followingformulas (15), (32), and (43): wherein in the formula (15), one or moresets of adjacent two or more of R₁₁₁ to R₁₁₈ form an unsubstituted,saturated or unsaturated ring by bonding with each other, or do not forman unsubstituted, saturated or unsaturated ring, R₁₁₁ to R₁₁₈ are not amonovalent group represented by the following formula (12): wherein inthe formula (12), Ar₁₀₁ and Ar₁₀₂ are independently an unsubstitutedaryl group including 6 to 50 ring carbon atoms, or an unsubstitutedmonovalent heterocyclic group including 5 to 50 ring atoms, L₁₀₁ to L₁₀₃are independently a single bond, an unsubstituted arylene groupincluding 6 to 30 ring carbon atoms, or an unsubstituted divalentheterocyclic group including 5 to 30 ring atoms; R₁₁₁ to R₁₁₈ which donot form an unsubstituted, saturated or unsaturated ring, and are not amonovalent group represented by the formula (12) are independently ahydrogen atom, an unsubstituted alkyl group including 1 to 50 carbonatoms, an unsubstituted alkenyl group including 2 to 50 carbon atoms, anunsubstituted alkynyl group including 2 to 50 carbon atoms, anunsubstituted cycloalkyl group including 3 to 50 ring carbon atoms,—Si(R₉₀₁)(R₉₀₂)(R₉₀₃), —O—(R₉₀₄), —S—(R₉₀₅), —N(R₉₀₆)(R₉₀₇), a halogenatom, a cyano group, a nitro group, an unsubstituted aryl groupincluding 6 to 50 ring carbon atoms, or an unsubstituted monovalentheterocyclic group including 5 to 50 ring atoms, R₉₀₁ to R₉₀₇ are asdefined in the formula (1), Ar₁₀₁ and Ar₁₀₂ are independently anunsubstituted aryl group including 6 to 50 ring carbon atoms, or anunsubstituted monovalent heterocyclic group including 5 to 50 ringatoms, and L₁₀₁ to Ll₀₃ are independently a single bond, anunsubstituted arylene group including 6 to 30 ring carbon atoms, or anunsubstituted divalent heterocyclic group including 5 to 30 ring atoms;wherein in the formula (32), one or more sets of adjacent two or more ofR₃₃₁ to R₃₃₄ and R₃₄₁ to R₃₄₄ form an unsubstituted, saturated orunsaturated ring, or do not form an unsubstituted, saturated orunsaturated ring, R₃₃₁ to R₃₃₄ and R₃₄₁ to R₃₄₄ which do not form theunsubstituted, saturated or unsaturated ring, and R₃₅₁ and R₃₅₂ areindependently a hydrogen atom, an unsubstituted aryl group including 6to 50 ring carbon atoms, or an unsubstituted monovalent heterocyclicgroup including 5 to 50 ring atoms, and R₃₆₁ to R₃₆₄ are independentlyan unsubstituted aryl group including 6 to 50 ring carbon atoms, or anunsubstituted monovalent heterocyclic group including 5 to 50 ringatoms; and

wherein in the formula (43), R₄₃₁ forms an unsubstituted heterocyclicring by bonding with R₄₄₆, or does not form an unsubstitutedheterocyclic ring, R₄₃₃ forms an unsubstituted heterocyclic ring bybonding with R₄₄₇, or does not form an unsubstituted heterocyclic ring,R₄₃₄ forms an unsubstituted heterocyclic ring by bonding with R₄₅₁, ordoes not form an unsubstituted heterocyclic ring, R₄₄₁ forms anunsubstituted heterocyclic ring by bonding with R₄₄₂, or does not forman unsubstituted heterocyclic ring, one or more sets of adjacent two ormore of R₄₃₁ to R₄₅₁ form an unsubstituted, saturated or unsaturatedring by bonding with each other, or do not form an unsubstituted,saturated or unsaturated ring, R₄₃₁ to R₄₅₁ which do not form theunsubstituted heterocyclic ring or the unsubstituted, saturated orunsaturated ring are independently a hydrogen atom, an unsubstitutedalkyl group including 1 to 50 carbon atoms, an unsubstituted alkenylgroup including 2 to 50 carbon atoms, an unsubstituted alkynyl groupincluding 2 to 50 carbon atoms, an unsubstituted cycloalkyl groupincluding 3 to 50 ring carbon atoms, —Si(R₉₀₁)(R₉₀₂)(R₉₀₃), —O—(R₉₀₄),—S—(R₉₀₅), —N(R₉₀₆)(R₉₀₇), a halogen atom, a cyano group, a nitro group,an unsubstituted aryl group including 6 to 50 ring carbon atoms, or anunsubstituted monovalent heterocyclic group including 5 to 50 ringatoms, and R₉₀₁ to R₉₀₇ are as defined in the formula (1).
 16. Theorganic electroluminescence device according to claim 1, wherein thedopant material is selected from the group consisting of:

wherein in the formula (17), one or more sets of adjacent two or more ofR₁₁₁ to R₁₁₈ form an unsubstituted, saturated or unsaturated ring bybonding with each other, or do not form an unsubstituted, saturated orunsaturated ring, R₁₁₁ to R₁₁₈ are not a monovalent group represented bythe following formula (12):

wherein in the formula (12), Ar₁₀₁ and Ar₁₀₂ are independently anunsubstituted aryl group including 6 to 50 ring carbon atoms, or anunsubstituted monovalent heterocyclic group including 5 to 50 ringatoms, L₁₀₁ to L₁₀₃ are independently a single bond, an unsubstitutedarylene group including 6 to 30 ring carbon atoms, or an unsubstituteddivalent heterocyclic group including 5 to 30 ring atoms; R₁₁₁ to R₁₁₈which do not form an unsubstituted, saturated or unsaturated ring, andare not a monovalent group represented by the formula (12) areindependently a hydrogen atom, an unsubstituted alkyl group including 1to 50 carbon atoms, an unsubstituted alkenyl group including 2 to 50carbon atoms, an unsubstituted alkynyl group including 2 to 50 carbonatoms, an unsubstituted cycloalkyl group including 3 to 50 ring carbonatoms, —Si(R₉₀₁)(R₉₀₂)(R₉₀₃), —O—(R₉₀₄), —S—(R₉₀₅), —N(R₉₀₆)(R₉₀₇), ahalogen atom, a cyano group, a nitro group, an unsubstituted aryl groupincluding 6 to 50 ring carbon atoms, or an unsubstituted monovalentheterocyclic group including 5 to 50 ring atoms, R₉₀₁ to R₉₀₇ are asdefined in the formula (1), one or more sets of adjacent two or more ofR₁₂₁ to R₁₂₇ form an unsubstituted, saturated or unsaturated ring bybonding with each other, or do not form an unsubstituted, saturated orunsaturated ring, R₁₂₁ to R₁₂₇ which do not form the unsubstituted,saturated or unsaturated ring are independently a hydrogen atom, anunsubstituted alkyl group including 1 to 50 carbon atoms, anunsubstituted alkenyl group including 2 to 50 carbon atoms, anunsubstituted alkynyl group including 2 to 50 carbon atoms, anunsubstituted cycloalkyl group including 3 to 50 ring carbon atoms,—Si(R₉₀₁)(R₉₀₂)(R₉₀₃), —O—(R₉₀₄), —S—(R₉₀₅), —N(R₉₀₆)(R₉₀₇), a halogenatom, a cyano group, a nitro group, an unsubstituted aryl groupincluding 6 to 50 ring carbon atoms, or an unsubstituted monovalentheterocyclic group including 5 to 50 ring atoms, R₉₀₁ to R₉₀₇ are asdefined in the formula (1), R₁₃₁ to R₁₃₅ are independently a hydrogenatom, an unsubstituted alkyl group including 1 to 50 carbon atoms, anunsubstituted alkenyl group including 2 to 50 carbon atoms, anunsubstituted alkynyl group including 2 to 50 carbon atoms, anunsubstituted cycloalkyl group including 3 to 50 ring carbon atoms,—Si(R₉₀₁)(R₉₀₂)(R₉₀₃), —O—(R₉₀₄), —S—(R₉₀₅), —N(R₉₀₆)(R₉₀₇), a halogenatom, a cyano group, a nitro group, an unsubstituted aryl groupincluding 6 to 50 ring carbon atoms, or an unsubstituted monovalentheterocyclic group including 5 to 50 ring atoms, and R₉₀₁ to R₉₀₇ are asdefined in the formula (1);

wherein in the formula (33), R₃₅₁ and R₃₅₂ are independently a hydrogenatom, an unsubstituted aryl group including 6 to 50 ring carbon atoms,or an unsubstituted monovalent heterocyclic group including 5 to 50 ringatoms, and R₃₆₁ to R₃₆₄ are independently an unsubstituted aryl groupincluding 6 to 50 ring carbon atoms, or an unsubstituted monovalentheterocyclic group including 5 to 50 ring atoms;

wherein in the formula (43A), R₄₆₁ is a hydrogen atom, an unsubstitutedalkyl group including 1 to 50 carbon atoms, an unsubstituted alkenylgroup including 2 to 50 carbon atoms, an unsubstituted alkynyl groupincluding 2 to 50 carbon atoms, an unsubstituted cycloalkyl groupincluding 3 to 50 ring carbon atoms, or an unsubstituted aryl groupincluding 6 to 50 ring carbon atoms, and R₄₆₂ to R₄₆₅ are independentlyan unsubstituted alkyl group including 1 to 50 carbon atoms, anunsubstituted alkenyl group including 2 to 50 carbon atoms, anunsubstituted alkynyl group including 2 to 50 carbon atoms, anunsubstituted cycloalkyl group including 3 to 50 ring carbon atoms, oran unsubstituted aryl group including 6 to 50 ring carbon atoms.
 17. Theorganic electroluminescence device according to claim 1, wherein thedopant material is one or more compounds selected from the groupconsisting of:


18. A composition for an emitting layer of an organicelectroluminescence device, comprising: a first host material, and asecond host material, wherein, the first host material is a compoundrepresented by the following formula (1) having at least one deuteriumatom, and the second host material is a compound represented by thefollowing formula (1′):

wherein in the formula (1), R₁ to R₈ are independently a hydrogen atom,an unsubstituted alkyl group including 1 to 50 carbon atoms, anunsubstituted alkenyl group including 2 to 50 carbon atoms, anunsubstituted alkynyl group including 2 to 50 carbon atoms, anunsubstituted cycloalkyl group including 3 to 50 ring carbon atoms,—Si(R₉₀₁)(R₉₀₂)(R₉₀₃), —O—(R₉₀₄), —S—(R₉₀₅), —N(R₉₀₆)(R₉₀₇), a halogenatom, a cyano group, a nitro group, an unsubstituted aryl groupincluding 6 to 50 ring carbon atoms, or an unsubstituted monovalentheterocyclic group including 5 to 50 ring atoms, R₉₀₁ to R₉₀₇ areindependently a hydrogen atom, an unsubstituted alkyl group including 1to 50 carbon atoms, an unsubstituted cycloalkyl group including 3 to 50ring carbon atoms, an unsubstituted aryl group including 6 to 50 ringcarbon atoms, or an unsubstituted monovalent heterocyclic groupincluding 5 to 50 ring atoms, when two or more of each of R₉₀₁ to R₉₀₇are present, the two or more of each of R₉₀₁ to R₉₀₇ are the same as ordifferent from each other, adjacent two or more of R₁ to R₄, andadjacent two or more of R₅ to R₈ do not form a ring by bonding with eachother, L₁ and L₂ are independently a single bond, an unsubstitutedarylene group including 6 to 30 ring carbon atoms, or an unsubstituteddivalent heterocyclic group including 5 to 30 ring atoms, Ar₁ and Ar₂are independently an unsubstituted phenyl group, an unsubstitutedbiphenyl group, an unsubstituted naphthyl group, or an unsubstituteddibenzofuranyl group, and at least one hydrogen atom selected from thefollowing is a deuterium atom: hydrogen atoms of R₁ to R₈ in the casewhere they are hydrogen atoms, and hydrogen atoms possessed by one ormore groups selected from R₁ to R₈ which are not hydrogen atoms, L₁which is not a single bond, L₂ which is not a single bond, and Ar₁ andAr₂; and

wherein in the formula (1′), R₁ to R₈ are independently a hydrogen atom,an unsubstituted alkyl group including 1 to 50 carbon atoms, anunsubstituted alkenyl group including 2 to 50 carbon atoms, anunsubstituted alkynyl group including 2 to 50 carbon atoms, anunsubstituted cycloalkyl group including 3 to 50 ring carbon atoms,—Si(R₉₀₁)(R₉₀₂)(R₉₀₃), —O—(R₉₀₄), —S—(R₉₀₅), —N(R₉₀₆)(R₉₀₇), a halogenatom, a cyano group, a nitro group, an unsubstituted aryl groupincluding 6 to 50 ring carbon atoms, or an unsubstituted monovalentheterocyclic group including 5 to 50 ring atoms, R₉₀₁ to R₉₀₇ areindependently a hydrogen atom, an unsubstituted alkyl group including 1to 50 carbon atoms, an unsubstituted cycloalkyl group including 3 to 50ring carbon atoms, an unsubstituted aryl group including 6 to 50 ringcarbon atoms, or an unsubstituted monovalent heterocyclic groupincluding 5 to 50 ring atoms, when two or more of each of R₉₀₁ to R₉₀₇are present, the two or more of each of R₉₀₁ to R₉₀₇ are the same as ordifferent from each other, adjacent two or more of R₁ to R₄, andadjacent two or more of R₅ to R₈ do not form a ring by bonding with eachother, L₁ and L₂ are independently a single bond, an unsubstitutedarylene group including 6 to 30 ring carbon atoms, or an unsubstituteddivalent heterocyclic group including 5 to 30 ring atoms, and Ar₁ andAr₂ are independently an unsubstituted phenyl group, an unsubstitutedbiphenyl group, an unsubstituted naphthyl group, or an unsubstituteddibenzofuranyl group, wherein the second host material is a compoundthat does not substantially comprise a deuterium atom, -L₁-Ar₁ in thefirst host material represented by the formula (1) has the same chemicalstructure as -L₁-Ar₁ in the second host material represented by theformula (1′) except that when -L₁-Ar₁ in the first host materialcomprises at least one deuterium atom, each of such at least onedeuterium atom in -L₁-Ar₁ of the first host material is replaced by aprotium atom in -L₁-Ar₁ of the second host material and the chemicalstructure when all of the deuterium atoms of the first host material isreplaced with protium atom is different from the chemical structure ofthe second host material.
 19. An electronic apparatus, equipped with theorganic electroluminescence device according to claim
 1. 20. The organicelectroluminescence device according to claim 1, wherein the fluorescentdopant material is a blue emitting dopant.
 21. The organicelectroluminescence device according to claim 1, having a tandem-typeconfiguration comprising a plurality of emitting units, wherein at leastone emitting unit of said plurality of emitting units comprises thefirst fluorescent emitting layer.
 22. The organic electroluminescencedevice according to claim 4, having a tandem-type configurationcomprising a plurality of emitting units, wherein at least one emittingunit of said plurality of emitting units comprises the first fluorescentemitting layer and the second emitting layer.
 23. The organicelectroluminescence device according to claim 21, wherein the pluralityof emitting units comprises a first emitting unit and a second emittingunit and wherein the device further comprises a charge-generating layerbetween the first emitting unit and the second emitting unit.
 24. Theorganic electroluminescence device according to claim 22, wherein theplurality of emitting units comprises a first emitting unit and a secondemitting unit and wherein the device further comprises acharge-generating layer between the first emitting unit and the secondemitting unit.